diff --git a/schemas/sturdy.prs b/schemas/sturdy.prs
index 0481cda..0a8da44 100644
--- a/schemas/sturdy.prs
+++ b/schemas/sturdy.prs
@@ -8,7 +8,7 @@ embeddedType EntityRef.Cap .
 ;     e = canonical machine-oriented serialization of some preserves value, and
 ;     k = the original secret key for the ref.
 ;
-; The `sig` is then f(f(f(f(k, e(oid)), ...), Caveat), ...).
+; The `sig` is then f(f(f(f(k, e(oid)), ...), e(Caveat)), ...).
 ;
 SturdyRef = <ref @oid any @caveatChain [Caveat ...] @sig bytes>.