Update real-time-synthesis-avatar.md

Author: sally-baolian

articles/ai-services/speech-service/text-to-speech-avatar/real-time-synthesis-avatar.md

@@ -141,6 +141,8 @@ avatarSynthesizer.startAvatarAsync(peerConnection).then(
 );
 ```
 
+Our real-time API disconnects after 5 minutes of avatar's idle state. Even if the avatar is not idle and functioning normally, the real-time API will disconnect after a 10-minute connection. To ensure continuous operation of the real-time avatar for more than 10 minutes, you can enable auto-reconnect. For how to set up auto-reconnect, refer to this [sample code](https://github.com/Azure-Samples/cognitive-services-speech-sdk/blob/master/samples/js/browser/avatar/README.md) (search "auto reconnect").
+
 ## Synthesize talking avatar video from text input
 
 After the above steps, you should see the avatar video being played in the web browser. The avatar is active, with eye blink and slight body movement, but not speaking yet. The avatar is waiting for text input to start speaking.