diff --git a/zips/zip-0312.rst b/zips/zip-0312.rst
index faff88cf..f2b13eb1 100644
--- a/zips/zip-0312.rst
+++ b/zips/zip-0312.rst
@@ -152,8 +152,8 @@ adjusted as follows:
   public key `PK` [#frost-protocol]_.
 - The Spend authorizing key :math:`\mathsf{ask}` is replaced by the logical
   signing key that corresponds to the group public key `PK`. By design, this
-  key never exists, and instead is represented by each participant's FROST
-  signing key share `sk_i`.
+  key is never explicitly constructed, and instead is represented by any
+  sufficient subset of the participant FROST signing key shares `sk_i`.
 
 The remaining parts of the Sapling and Orchard key trees are generated from
 a common... (TODO: Finish specifying how the other common parts of the