1 files changed, 5 insertions, 0 deletions

diff --git a/docs/modules/spam_checker_callbacks.md b/docs/modules/spam_checker_callbacks.md

index 6dfa2a7b25..39d7cbc000 100644
--- a/docs/modules/spam_checker_callbacks.md
+++ b/docs/modules/spam_checker_callbacks.md
@@ -254,6 +254,11 @@ _First introduced in Synapse v1.132.0_
 async def user_may_send_state_event(user_id: str, room_id: str, event_type: str, state_key: str, content: JsonDict) -> Union["synapse.module_api.NOT_SPAM", "synapse.module_api.errors.Codes"]
 ```
 
+**<span style="color:red">
+Caution: This callback is currently experimental . The method signature or behaviour
+may change without notice.
+</span>**
+
 Called when processing a request to [send state events](https://spec.matrix.org/latest/client-server-api/#put_matrixclientv3roomsroomidstateeventtypestatekey) to a room.
 
 The arguments passed to this callback are: