diff --git a/.ably/capabilities.yaml b/.ably/capabilities.yaml
index a38444fc1..4140330ec 100644
--- a/.ably/capabilities.yaml
+++ b/.ably/capabilities.yaml
@@ -43,6 +43,7 @@ compliance:
     Connection:
       Disconnected Retry Timeout:
       Get Identifier:
+      Incremental Backoff:
       Lifecycle Control:
       Ping:
       Recovery: