diff --git a/support/doc/plugins/guide.md b/support/doc/plugins/guide.md
index 1c809258a..a1131ced5 100644
--- a/support/doc/plugins/guide.md
+++ b/support/doc/plugins/guide.md
@@ -320,6 +320,8 @@ The `ping` route can be accessed using:
 
 #### Add custom WebSocket handlers
 
+**PeerTube >= 5.0**
+
 You can create custom WebSocket servers (like [ws](https://github.com/websockets/ws) for example) using `registerWebSocketRoute`:
 
 ```js