diff --git a/pkg/common/constant/constant.go b/pkg/common/constant/constant.go
index 6e32cea2e..0e2bfe4da 100644
--- a/pkg/common/constant/constant.go
+++ b/pkg/common/constant/constant.go
@@ -138,4 +138,10 @@ const (
 	Female = 2
 )
 
+const (
+	UnreliableNotification    = 1
+	ReliableNotificationNoMsg = 2
+	ReliableNotificationMsg   = 3
+)
+
 const FriendAcceptTip = "You have successfully become friends, so start chatting"