diff --git a/changelogs/client_server/newsfragments/2344.clarification b/changelogs/client_server/newsfragments/2344.clarification
new file mode 100644
index 00000000..09fddbd1
--- /dev/null
+++ b/changelogs/client_server/newsfragments/2344.clarification
@@ -0,0 +1 @@
+Clarify SAS commitment calculation for `m.key.verification.accept` messages.
diff --git a/data/event-schemas/schema/m.key.verification.accept.yaml b/data/event-schemas/schema/m.key.verification.accept.yaml
index c9ea2d18..0fbc49d4 100644
--- a/data/event-schemas/schema/m.key.verification.accept.yaml
+++ b/data/event-schemas/schema/m.key.verification.accept.yaml
@@ -44,7 +44,8 @@ properties:
         description: |-
           The hash (encoded as unpadded base64) of the concatenation of the device's
           ephemeral public key (encoded as unpadded base64) and the canonical JSON
-          representation of the `m.key.verification.start` message.
+          representation of the `content` object of the `m.key.verification.start`
+          message.
       m.relates_to:
         $ref: m.key.verification.m.relates_to.yaml
     required: