Add system message in chat.md

Signed-off-by: Vitor Mattos <vitor@php.rio>

1 files changed, 1 insertions, 1 deletions

diff --git a/docs/chat.md b/docs/chat.md
index 10485987b..05b973200 100644
--- a/docs/chat.md
+++ b/docs/chat.md
@@ -384,4 +384,4 @@ See [OCP\RichObjectStrings\Definitions](https://github.com/nextcloud/server/blob
 * Creating a poll is an `object_shared` with a poll object
 * `poll_voted` - {actor} voted on the poll {poll}
 * `poll_closed` - {actor} closed the poll {poll}
-
+* `message_expire_enabled` - {actor} set the self-destruction timer to {seconds} sec