diff --git a/pjsip/include/pjsua-lib/pjsua.h b/pjsip/include/pjsua-lib/pjsua.h
index 9316778..4727448 100644
--- a/pjsip/include/pjsua-lib/pjsua.h
+++ b/pjsip/include/pjsua-lib/pjsua.h
@@ -3037,9 +3037,12 @@
 
 
 /**
- * This specifies how long the library should retry resending SUBSCRIBE
- * if the previous SUBSCRIBE failed. This also controls the duration 
- * before failed PUBLISH request will be retried.
+ * This specifies how long the library should wait before retrying failed
+ * SUBSCRIBE request, and there is no rule to automatically resubscribe 
+ * (for example, no "retry-after" parameter in Subscription-State header).
+ *
+ * This also controls the duration  before failed PUBLISH request will be
+ * retried.
  *
  * Default: 300 seconds
  */