diff --git a/src/content/docs/realtime/turn/generate-credentials.mdx b/src/content/docs/realtime/turn/generate-credentials.mdx
index c92140ffabda218..f27c5e82dd2dd37 100644
--- a/src/content/docs/realtime/turn/generate-credentials.mdx
+++ b/src/content/docs/realtime/turn/generate-credentials.mdx
@@ -53,6 +53,10 @@ The JSON response below can then be passed on to your front-end application:
 }
 ```
 
+:::note
+The list of returned URLs contains URLs with the primary and alternate ports. The alternate port 53 is known to be blocked by web browsers, and the TURN URL will time out if used in browsers. If you are using trickle ICE, this will not cause issues. Without trickle ICE you might want to filter out the URL with port 53 to avoid waiting for a timeout.
+:::
+
 Use `iceServers` as follows when instantiating the `RTCPeerConnection`:
 
 ```js