diff --git a/book/src/IDENTIFIERS.json b/book/src/IDENTIFIERS.json
new file mode 100644
index 00000000..8080c0ec
--- /dev/null
+++ b/book/src/IDENTIFIERS.json
@@ -0,0 +1,19 @@
+{
+    "commit-ivk-bit-lengths": "design/circuit/commit-ivk.html#bit-length-constraints",
+    "commit-ivk-canonicity-ak": "design/circuit/commit-ivk.html#canonicity-ak",
+    "commit-ivk-canonicity-nk": "design/circuit/commit-ivk.html#canonicity-nk",
+    "commit-ivk-decompositions": "design/circuit/commit-ivk.html#constrain-bit-lengths",
+    "commit-ivk-region-layout": "design/circuit/commit-ivk.html#region-layout",
+    "note-commit-canonicity-g_d": "design/circuit/note-commit.html#canonicity-g_d",
+    "note-commit-canonicity-pk_d": "design/circuit/note-commit.html#canonicity-pk_d",
+    "note-commit-canonicity-psi": "design/circuit/note-commit.html#canonicity-psi",
+    "note-commit-canonicity-rho": "design/circuit/note-commit.html#canonicity-rho",
+    "note-commit-canonicity-v": "design/circuit/note-commit.html#canonicity-v",
+    "note-commit-canonicity-y": "design/circuit/note-commit.html#canonicity-y",
+    "note-commit-decomposition-b": "design/circuit/note-commit.html#decomposition-b",
+    "note-commit-decomposition-d": "design/circuit/note-commit.html#decomposition-d",
+    "note-commit-decomposition-e": "design/circuit/note-commit.html#decomposition-e",
+    "note-commit-decomposition-g": "design/circuit/note-commit.html#decomposition-g",
+    "note-commit-decomposition-h": "design/circuit/note-commit.html#decomposition-h",
+    "note-commit-decomposition-y": "design/circuit/note-commit.html#decomposition-y"
+}
\ No newline at end of file
diff --git a/book/src/design/circuit/commit-ivk.md b/book/src/design/circuit/commit-ivk.md
index 26c33cfa..dd8c588d 100644
--- a/book/src/design/circuit/commit-ivk.md
+++ b/book/src/design/circuit/commit-ivk.md
@@ -146,7 +146,7 @@ $\NullifierKey$).
 > - Let $x' = x + t' - t$.
 > - Enforce $0 \leq x' < t'$.
 
-### $\AuthSignPublic$ with $b_1 = 1 \implies \AuthSignPublic \geq 2^{254}$
+### $\AuthSignPublic$ with $b_1 = 1 \implies \AuthSignPublic \geq 2^{254}$ <a name="canonicity-ak">
 
 In these cases, we check that $\textsf{ak}_{0..=253} < t_\mathbb{P}$:
 
@@ -181,7 +181,7 @@ $$
 \end{array}
 $$
 
-### $\NullifierKey$ with $d_1 = 1 \implies \NullifierKey \geq 2^{254}$
+### $\NullifierKey$ with $d_1 = 1 \implies \NullifierKey \geq 2^{254}$ <a name="canonicity-nk">
 
 In these cases, we check that $\textsf{nk}_{0..=253} < t_\mathbb{P}$:
 
diff --git a/book/src/design/circuit/note-commit.md b/book/src/design/circuit/note-commit.md
index e3e04fc6..5e8b3c9f 100644
--- a/book/src/design/circuit/note-commit.md
+++ b/book/src/design/circuit/note-commit.md
@@ -104,7 +104,7 @@ The following helper gates are defined:
 - $\ShortLookupRangeCheck{}$ is a
   [short lookup range check](../decomposition.md#short-range-check).
 
-### $b = b_0 \bconcat b_1 \bconcat b_2 \bconcat b_3$
+### $b = b_0 \bconcat b_1 \bconcat b_2 \bconcat b_3$ <a name="decomposition-b">
 $b$ has been constrained to be $10$ bits by the Sinsemilla hash.
 
 #### Region layout
@@ -132,7 +132,7 @@ Outside this gate, we have constrained:
 - $\ShortLookupRangeCheck{b_0, 4}$
 - $\ShortLookupRangeCheck{b_3, 4}$
 
-### $d = d_0 \bconcat d_1 \bconcat d_2 \bconcat d_3$
+### $d = d_0 \bconcat d_1 \bconcat d_2 \bconcat d_3$ <a name="decomposition-d">
 $d$ has been constrained to be $60$ bits by the $\SinsemillaHash$.
 
 #### Region layout
@@ -161,7 +161,7 @@ Outside this gate, we have constrained:
 - $d_3$ is equality-constrained to $z_{d,1}$, where the latter is the index-1 running sum
   output of $\SinsemillaHash(d),$ constrained by the hash to be $50$ bits.
 
-### $e = e_0 \bconcat e_1$
+### $e = e_0 \bconcat e_1$ <a name="decomposition-e">
 $e$ has been constrained to be $10$ bits by the $\SinsemillaHash$.
 
 #### Region layout
@@ -186,7 +186,7 @@ Outside this gate, we have constrained:
 - $\ShortLookupRangeCheck{e_0, 6}$
 - $\ShortLookupRangeCheck{e_1, 4}$
 
-### $g = g_0 \bconcat g_1 \bconcat g_2$
+### $g = g_0 \bconcat g_1 \bconcat g_2$ <a name="decomposition-g">
 $g$ has been constrained to be $250$ bits by the $\SinsemillaHash$.
 
 #### Region layout
@@ -214,7 +214,7 @@ Outside this gate, we have constrained:
 - $g_2$ is equality-constrained to $z_{g,1}$, where the latter is the index-1 running sum
   output of $\SinsemillaHash(g),$ constrained by the hash to be 240 bits.
 
-### $h = h_0 \bconcat h_1 \bconcat h_2$
+### $h = h_0 \bconcat h_1 \bconcat h_2$ <a name="decomposition-h">
 $h$ has been constrained to be $10$ bits by the $\SinsemillaHash$.
 
 #### Region layout
@@ -280,7 +280,7 @@ below are enforced if and only if the corresponding top bit is set to 1.
 > - Let $x' = x + t' - t$.
 > - Enforce $0 \leq x' < t'$.
 
-### $x(\mathsf{g_d})$ with $b_1 = 1 \implies x(\mathsf{g_d}) \geq 2^{254}$
+### $x(\mathsf{g_d})$ with $b_1 = 1 \implies x(\mathsf{g_d}) \geq 2^{254}$ <a name="canonicity-g_d">
 Recall that $x(\mathsf{g_d}) = a + 2^{250} \cdot b_0 + 2^{254} \cdot b_1$. When the top
 bit $b_1$ is set, we check that $x(\mathsf{g_d})_{0..=253} < t_\mathbb{P}$:
 
@@ -327,7 +327,7 @@ $$
 \end{array}
 $$
 
-### $x(\mathsf{pk_d})$ with $d_0 = 1 \implies x(\mathsf{pk_d}) \geq 2^{254}$
+### $x(\mathsf{pk_d})$ with $d_0 = 1 \implies x(\mathsf{pk_d}) \geq 2^{254}$ <a name="canonicity-pk_d">
 Recall that $x(\mathsf{pk_d}) = b_3 + 2^4 \cdot c + 2^{254} \cdot d_0$. When the top bit
 $d_0$ is set, we check that $x(\mathsf{pk_d})_{0..=253} < t_\mathbb{P}$:
 
@@ -368,7 +368,7 @@ $$
 \end{array}
 $$
 
-### $\mathsf{v} = d_2 + 2^8 \cdot d_3 + 2^{58} \cdot e_0$
+### $\mathsf{v} = d_2 + 2^8 \cdot d_3 + 2^{58} \cdot e_0$ <a name="canonicity-v">
 
 #### Region layout
 $$
@@ -388,7 +388,7 @@ $$
 \end{array}
 $$
 
-### $\rho$ with $g_0 = 1 \implies \rho \geq 2^{254}$
+### $\rho$ with $g_0 = 1 \implies \rho \geq 2^{254}$ <a name="canonicity-rho">
 Recall that $\rho = e_1 + 2^4 \cdot f + 2^{254} \cdot g_0$. When the top bit $g_0$ is set,
 we check that $\rho_{0..=253} < t_\mathbb{P}$:
 
@@ -429,7 +429,7 @@ $$
 \end{array}
 $$
 
-### $\psi$ with $h_1 = 1 \implies \psi \geq 2^{254}$
+### $\psi$ with $h_1 = 1 \implies \psi \geq 2^{254}$ <a name="canonicity-psi">
 Recall that $\psi = g_1 + 2^9 \cdot g_2 + 2^{249} \cdot h_0 + 2^{254} \cdot h_1$. When the
 top bit $h_1$ is set, we check that $\psi_{0..=253} < t_\mathbb{P}$:
 
@@ -476,7 +476,7 @@ $$
 \end{array}
 $$
 
-### $y$-coordinate checks
+### $y$-coordinate checks <a name="decomposition-y">
 
 Note that only the $ỹ$ LSB of the $y$-coordinates $y(\mathsf{g_d}), y(\mathsf{pk_d})$ was
 input to the hash, while the other bits of the $y$-coordinate were unused. However, we
@@ -523,7 +523,7 @@ $$
 \end{array}
 $$
 
-### $y(\mathsf{g_d})$ with $k_3 = 1 \implies y(\mathsf{g_d}) \geq 2^{254}$
+### $y(\mathsf{g_d})$ with $k_3 = 1 \implies y(\mathsf{g_d}) \geq 2^{254}$ <a name="canonicity-y">
 
 In these cases, we check that $y(\mathsf{g_d})_{0..=253} < t_\mathbb{P}$:
 
diff --git a/src/circuit.rs b/src/circuit.rs
index a64188fa..f1742a8d 100644
--- a/src/circuit.rs
+++ b/src/circuit.rs
@@ -143,10 +143,10 @@ impl plonk::Circuit<pallas::Base> for Circuit {
             meta.advice_column(),
         ];
 
-        // Constrain v_old - v_new = magnitude * sign
-        // Either v_old = 0, or calculated root = anchor
-        // Constrain v_old = 0 or enable_spends = 1.
-        // Constrain v_new = 0 or enable_outputs = 1.
+        // Constrain v_old - v_new = magnitude * sign    (https://p.z.cash/ZKS:action-cv-net-integrity?partial).
+        // Either v_old = 0, or calculated root = anchor (https://p.z.cash/ZKS:action-merkle-path-validity?partial).
+        // Constrain v_old = 0 or enable_spends = 1      (https://p.z.cash/ZKS:action-enable-spend).
+        // Constrain v_new = 0 or enable_outputs = 1     (https://p.z.cash/ZKS:action-enable-output).
         let q_orchard = meta.selector();
         meta.create_gate("Orchard circuit checks", |meta| {
             let q_orchard = meta.query_selector(q_orchard);
@@ -389,7 +389,7 @@ impl plonk::Circuit<pallas::Base> for Circuit {
             (psi_old, rho_old, cm_old, g_d_old, ak_P, nk, v_old, v_new)
         };
 
-        // Merkle path validity check.
+        // Merkle path validity check (https://p.z.cash/ZKS:action-merkle-path-validity?partial).
         let root = {
             let path = self
                 .path
@@ -404,7 +404,7 @@ impl plonk::Circuit<pallas::Base> for Circuit {
             merkle_inputs.calculate_root(layouter.namespace(|| "Merkle path"), leaf)?
         };
 
-        // Value commitment integrity.
+        // Value commitment integrity (https://p.z.cash/ZKS:action-cv-net-integrity?partial).
         let v_net_magnitude_sign = {
             // Witness the magnitude and sign of v_net = v_old - v_new
             let v_net_magnitude_sign = {
@@ -462,7 +462,7 @@ impl plonk::Circuit<pallas::Base> for Circuit {
             v_net_magnitude_sign
         };
 
-        // Nullifier integrity
+        // Nullifier integrity (https://p.z.cash/ZKS:action-nullifier-integrity).
         let nf_old = {
             let nf_old = gadget::derive_nullifier(
                 layouter.namespace(|| "nf_old = DeriveNullifier_nk(rho_old, psi_old, cm_old)"),
@@ -481,7 +481,7 @@ impl plonk::Circuit<pallas::Base> for Circuit {
             nf_old
         };
 
-        // Spend authority
+        // Spend authority (https://p.z.cash/ZKS:action-spend-authority)
         {
             let alpha =
                 ScalarFixed::new(ecc_chip.clone(), layouter.namespace(|| "alpha"), self.alpha)?;
@@ -501,7 +501,7 @@ impl plonk::Circuit<pallas::Base> for Circuit {
             layouter.constrain_instance(rk.inner().y().cell(), config.primary, RK_Y)?;
         }
 
-        // Diversified address integrity.
+        // Diversified address integrity (https://p.z.cash/ZKS:action-addr-integrity?partial).
         let pk_d_old = {
             let ivk = {
                 let ak = ak_P.extract_p().inner().clone();
@@ -547,7 +547,7 @@ impl plonk::Circuit<pallas::Base> for Circuit {
             pk_d_old
         };
 
-        // Old note commitment integrity.
+        // Old note commitment integrity (https://p.z.cash/ZKS:action-cm-old-integrity?partial).
         {
             let rcm_old = ScalarFixed::new(
                 ecc_chip.clone(),
@@ -575,7 +575,7 @@ impl plonk::Circuit<pallas::Base> for Circuit {
             derived_cm_old.constrain_equal(layouter.namespace(|| "cm_old equality"), &cm_old)?;
         }
 
-        // New note commitment integrity.
+        // New note commitment integrity (https://p.z.cash/ZKS:action-cmx-new-integrity?partial).
         {
             // Witness g_d_new
             let g_d_new = {
diff --git a/src/circuit/commit_ivk.rs b/src/circuit/commit_ivk.rs
index 2bee762f..1460c9d8 100644
--- a/src/circuit/commit_ivk.rs
+++ b/src/circuit/commit_ivk.rs
@@ -52,6 +52,8 @@ impl CommitIvkChip {
         //   - c: 240 bits,
         //   - d: 10 bits
         //
+        // https://p.z.cash/orchard-0.1:commit-ivk-decompositions
+        // https://p.z.cash/orchard-0.1:commit-ivk-region-layout?partial
         /*
             The pieces are laid out in this configuration:
 
@@ -106,6 +108,7 @@ impl CommitIvkChip {
             let d_decomposition_check = d_whole - (d_0.clone() + d_1.clone() * two_pow_9);
 
             // Check `b_1` and `d_1` are each a single-bit value.
+            // https://p.z.cash/orchard-0.1:commit-ivk-bit-lengths?partial
             let b1_bool_check = bool_check(b_1.clone());
             let d1_bool_check = bool_check(d_1.clone());
 
@@ -126,6 +129,7 @@ impl CommitIvkChip {
 
             // ak = a (250 bits) || b_0 (4 bits) || b_1 (1 bit)
             // The `ak` canonicity checks are enforced if and only if `b_1` = 1.
+            // https://p.z.cash/orchard-0.1:commit-ivk-canonicity-ak?partial
             let ak_canonicity_checks = {
                 // b_1 = 1 => b_0 = 0
                 let b0_canon_check = b_1.clone() * b_0;
@@ -163,6 +167,7 @@ impl CommitIvkChip {
 
             // nk = b_2 (5 bits) || c (240 bits) || d_0 (9 bits) || d_1 (1 bit)
             // The `nk` canonicity checks are enforced if and only if `d_1` = 1.
+            // https://p.z.cash/orchard-0.1:commit-ivk-canonicity-nk?partial
             let nk_canonicity_checks = {
                 // d_1 = 1 => d_0 = 0
                 let c0_canon_check = d_1.clone() * d_0;
@@ -257,6 +262,8 @@ pub(in crate::circuit) mod gadgets {
         //
         // We start by witnessing all of the individual pieces, and range-constraining
         // the short pieces b_0, b_2, and d_0.
+        //
+        // https://p.z.cash/orchard-0.1:commit-ivk-bit-lengths?partial
 
         // `a` = bits 0..=249 of `ak`
         let a = MessagePiece::from_subpieces(
@@ -327,6 +334,8 @@ pub(in crate::circuit) mod gadgets {
         // `ivk = ⊥` is handled internally to `CommitDomain::short_commit`: incomplete
         // addition constraints allows ⊥ to occur, and then during synthesis it detects
         // these edge cases and raises an error (aborting proof creation).
+        //
+        // https://p.z.cash/ZKS:action-addr-integrity?partial
         let (ivk, zs) = {
             let message = Message::from_pieces(
                 sinsemilla_chip.clone(),
@@ -385,6 +394,8 @@ pub(in crate::circuit) mod gadgets {
     }
 
     /// Witnesses and decomposes the `a'` value we need to check the canonicity of `ak`.
+    ///
+    /// [Specification](https://p.z.cash/orchard-0.1:commit-ivk-canonicity-ak?partial).
     #[allow(clippy::type_complexity)]
     fn ak_canonicity(
         lookup_config: &LookupRangeCheckConfig<pallas::Base, 10>,
@@ -424,6 +435,8 @@ pub(in crate::circuit) mod gadgets {
     }
 
     /// Witnesses and decomposes the `b2c'` value we need to check the canonicity of `nk`.
+    ///
+    /// [Specification](https://p.z.cash/orchard-0.1:commit-ivk-canonicity-nk?partial).
     #[allow(clippy::type_complexity)]
     fn nk_canonicity(
         lookup_config: &LookupRangeCheckConfig<pallas::Base, 10>,
@@ -468,7 +481,9 @@ pub(in crate::circuit) mod gadgets {
 }
 
 impl CommitIvkConfig {
-    /// Assign cells for the canonicity gate.
+    /// Assign cells for the [canonicity gate].
+    ///
+    /// [canonicity gate]: https://p.z.cash/orchard-0.1:commit-ivk-region-layout?partial
     /*
         The pieces are laid out in this configuration:
 
diff --git a/src/circuit/note_commit.rs b/src/circuit/note_commit.rs
index d2a27adf..b7163285 100644
--- a/src/circuit/note_commit.rs
+++ b/src/circuit/note_commit.rs
@@ -59,6 +59,8 @@ type CanonicityBounds = (
 /// ------------------------------------
 /// |  b  | b_0 | b_1 |       1        |
 /// |     | b_2 | b_3 |       0        |
+///
+/// https://p.z.cash/orchard-0.1:note-commit-decomposition-b?partial
 #[derive(Clone, Debug)]
 struct DecomposeB {
     q_notecommit_b: Selector,
@@ -207,6 +209,8 @@ impl DecomposeB {
 /// ------------------------------------
 /// |  d  | d_0 | d_1 |       1        |
 /// |     | d_2 | d_3 |       0        |
+///
+/// https://p.z.cash/orchard-0.1:note-commit-decomposition-d?partial
 #[derive(Clone, Debug)]
 struct DecomposeD {
     q_notecommit_d: Selector,
@@ -346,6 +350,8 @@ impl DecomposeD {
 /// | A_6 | A_7 | A_8 | q_notecommit_e |
 /// ------------------------------------
 /// |  e  | e_0 | e_1 |       1        |
+///
+/// https://p.z.cash/orchard-0.1:note-commit-decomposition-e?partial
 #[derive(Clone, Debug)]
 struct DecomposeE {
     q_notecommit_e: Selector,
@@ -463,6 +469,8 @@ impl DecomposeE {
 /// ------------------------------
 /// |  g  | g_0 |       1        |
 /// | g_1 | g_2 |       0        |
+///
+/// https://p.z.cash/orchard-0.1:note-commit-decomposition-g?partial
 #[derive(Clone, Debug)]
 struct DecomposeG {
     q_notecommit_g: Selector,
@@ -588,6 +596,8 @@ impl DecomposeG {
 /// | A_6 | A_7 | A_8 | q_notecommit_h |
 /// ------------------------------------
 /// |  h  | h_0 | h_1 |       1        |
+///
+/// https://p.z.cash/orchard-0.1:note-commit-decomposition-h?partial
 #[derive(Clone, Debug)]
 struct DecomposeH {
     q_notecommit_h: Selector,
@@ -708,6 +718,8 @@ impl DecomposeH {
 /// -----------------------------------------------------------
 /// | x(g_d) | b_0 | a       | z13_a       |        1         |
 /// |        | b_1 | a_prime | z13_a_prime |        0         |
+///
+/// https://p.z.cash/orchard-0.1:note-commit-canonicity-g_d?partial
 #[derive(Clone, Debug)]
 struct GdCanonicity {
     q_notecommit_g_d: Selector,
@@ -823,6 +835,8 @@ impl GdCanonicity {
 /// -------------------------------------------------------------------
 /// | x(pk_d) | b_3 |    c       | z13_c          |         1         |
 /// |         | d_0 | b3_c_prime | z14_b3_c_prime |         0         |
+///
+/// https://p.z.cash/orchard-0.1:note-commit-canonicity-pk_d?partial
 #[derive(Clone, Debug)]
 struct PkdCanonicity {
     q_notecommit_pk_d: Selector,
@@ -937,6 +951,8 @@ impl PkdCanonicity {
 /// |  A_6  | A_7 | A_8 | A_9 | q_notecommit_value |
 /// ------------------------------------------------
 /// | value | d_2 | d_3 | e_0 |          1         |
+///
+/// https://p.z.cash/orchard-0.1:note-commit-canonicity-v?partial
 #[derive(Clone, Debug)]
 struct ValueCanonicity {
     q_notecommit_value: Selector,
@@ -1013,6 +1029,8 @@ impl ValueCanonicity {
 /// --------------------------------------------------------------
 /// | rho | e_1 |    f       | z13_f          |        1         |
 /// |     | g_0 | e1_f_prime | z14_e1_f_prime |        0         |
+///
+/// https://p.z.cash/orchard-0.1:note-commit-canonicity-rho?partial
 #[derive(Clone, Debug)]
 struct RhoCanonicity {
     q_notecommit_rho: Selector,
@@ -1126,6 +1144,8 @@ impl RhoCanonicity {
 /// ----------------------------------------------------------------
 /// | psi | g_1 |   g_2       | z13_g           |        1         |
 /// | h_0 | h_1 | g1_g2_prime | z13_g1_g2_prime |        0         |
+///
+/// https://p.z.cash/orchard-0.1:note-commit-canonicity-psi?partial
 #[derive(Clone, Debug)]
 struct PsiCanonicity {
     q_notecommit_psi: Selector,
@@ -1296,6 +1316,7 @@ impl YCanonicity {
             let z13_j_prime = meta.query_advice(advices[9], Rotation::next());
 
             // Decomposition checks
+            // https://p.z.cash/orchard-0.1:note-commit-decomposition-y?partial
             let decomposition_checks = {
                 // Check that k_3 is boolean
                 let k3_check = bool_check(k_3.clone());
@@ -1316,6 +1337,7 @@ impl YCanonicity {
             };
 
             // Canonicity checks. These are enforced if and only if k_3 = 1.
+            // https://p.z.cash/orchard-0.1:note-commit-canonicity-y?partial
             let canonicity_checks = {
                 iter::empty()
                     .chain(Some(("k_3 = 1 => k_2 = 0", k_2)))
@@ -1652,6 +1674,9 @@ pub(in crate::circuit) mod gadgets {
         // `cm = ⊥` is handled internally to `CommitDomain::commit`: incomplete addition
         // constraints allows ⊥ to occur, and then during synthesis it detects these edge
         // cases and raises an error (aborting proof creation).
+        //
+        // https://p.z.cash/ZKS:action-cm-old-integrity?partial
+        // https://p.z.cash/ZKS:action-cmx-new-integrity?partial
         let (cm, zs) = {
             let message = Message::from_pieces(
                 chip.clone(),
@@ -1774,6 +1799,10 @@ pub(in crate::circuit) mod gadgets {
     }
 
     /// A canonicity check helper used in checking x(g_d), y(g_d), and y(pk_d).
+    ///
+    /// Specifications:
+    /// - [`g_d` canonicity](https://p.z.cash/orchard-0.1:note-commit-canonicity-g_d?partial)
+    /// - [`y` canonicity](https://p.z.cash/orchard-0.1:note-commit-canonicity-y?partial)
     fn canon_bitshift_130(
         lookup_config: &LookupRangeCheckConfig<pallas::Base, 10>,
         mut layouter: impl Layouter<pallas::Base>,
@@ -1806,6 +1835,8 @@ pub(in crate::circuit) mod gadgets {
     }
 
     /// Check canonicity of `x(pk_d)` encoding.
+    ///
+    /// [Specification](https://p.z.cash/orchard-0.1:note-commit-canonicity-pk_d?partial).
     fn pkd_x_canonicity(
         lookup_config: &LookupRangeCheckConfig<pallas::Base, 10>,
         mut layouter: impl Layouter<pallas::Base>,
@@ -1845,6 +1876,8 @@ pub(in crate::circuit) mod gadgets {
     }
 
     /// Check canonicity of `rho` encoding.
+    ///
+    /// [Specification](https://p.z.cash/orchard-0.1:note-commit-canonicity-rho?partial).
     fn rho_canonicity(
         lookup_config: &LookupRangeCheckConfig<pallas::Base, 10>,
         mut layouter: impl Layouter<pallas::Base>,
@@ -1884,6 +1917,8 @@ pub(in crate::circuit) mod gadgets {
     }
 
     /// Check canonicity of `psi` encoding.
+    ///
+    /// [Specification](https://p.z.cash/orchard-0.1:note-commit-canonicity-psi?partial).
     fn psi_canonicity(
         lookup_config: &LookupRangeCheckConfig<pallas::Base, 10>,
         mut layouter: impl Layouter<pallas::Base>,
@@ -1922,6 +1957,10 @@ pub(in crate::circuit) mod gadgets {
 
     /// Check canonicity of y-coordinate given its LSB as a value.
     /// Also, witness the LSB and return the witnessed cell.
+    ///
+    /// Specifications:
+    /// - [`y` decomposition](https://p.z.cash/orchard-0.1:note-commit-decomposition-y?partial)
+    /// - [`y` canonicity](https://p.z.cash/orchard-0.1:note-commit-canonicity-y?partial)
     fn y_canonicity(
         lookup_config: &LookupRangeCheckConfig<pallas::Base, 10>,
         y_canon: &YCanonicity,