diff --git a/spec/_attachments/interface-spec-changelog.md b/spec/_attachments/interface-spec-changelog.md
index f23884238..69dff4225 100644
--- a/spec/_attachments/interface-spec-changelog.md
+++ b/spec/_attachments/interface-spec-changelog.md
@@ -12,6 +12,7 @@
 * Remove `senders` field from user delegations.
 * The maximum length of a nonce in an ingress message is 32 bytes.
 * Update specification of responses from the endpoint `/api/v2/status`.
+* Stop canister calls might be rejected upon timeout.
 
 ### 0.21.0 (2023-09-18) {#0_21_0}
 * Canister cycle balance cannot decrease below the freezing limit after executing `install_code` on the management canister.