diff --git a/zip-0224.html b/zip-0224.html
index d982f163..5fe278f4 100644
--- a/zip-0224.html
+++ b/zip-0224.html
@@ -100,7 +100,9 @@ Discussions-To: &lt;<a href="https://github.com/zcash/zips/issues/435">https://g
                      is now a field element.</li>
                     <li>
                         <span class="math">\(\mathsf{ivk}\)</span>
-                     is computed as a Sinsemilla commitment instead of a BLAKE2s output.</li>
+                     is computed as a Sinsemilla commitment instead of a BLAKE2s output. There is an additional
+                        <span class="math">\(\mathsf{rivk}\)</span>
+                     component of the full viewing key that acts as the randomizer for this commitment.</li>
                     <li>
                         <span class="math">\(\mathsf{ovk}\)</span>
                      is derived from
diff --git a/zip-0224.rst b/zip-0224.rst
index 1fc352da..1958fcb0 100644
--- a/zip-0224.rst
+++ b/zip-0224.rst
@@ -158,6 +158,8 @@ changes:
 
 - The proof authorizing key is removed, and :math:`\mathsf{nk}` is now a field element.
 - :math:`\mathsf{ivk}` is computed as a Sinsemilla commitment instead of a BLAKE2s output.
+  There is an additional :math:`\mathsf{rivk}` component of the full viewing key that acts
+  as the randomizer for this commitment.
 - :math:`\mathsf{ovk}` is derived from :math:`\mathsf{fvk}`, instead of being a component
   of the spending key.
 - All diversifiers now result in valid payment addresses.