diff --git a/docs/contrib/environment.md b/docs/contrib/environment.md
index 8de602d99..ff62629de 100644
--- a/docs/contrib/environment.md
+++ b/docs/contrib/environment.md
@@ -500,6 +500,9 @@ This section involves setting up additional configuration variables for Websocke
 | TOKEN_EXPIRE            | "90"              | Token Expiry Time                  |
 | FRIEND_VERIFY           | "false"           | Friend Verification Enable         |
 | IOS_PUSH_SOUND          | "xxx"             | iOS                                |
+| CALLBACK_ENABLE         | "true"            | Enable callback                    | 
+| CALLBACK_TIMEOUT        | "5"               | Maximum timeout for callback call  |
+| CALLBACK_FAILED_CONTINUE| "true"            | fails to continue to the next step |
 ###  2.20. <a name='PrometheusConfiguration-1'></a>Prometheus Configuration
 
 This section involves configuring Prometheus, including enabling/disabling it and setting up ports for various services.