diff --git a/etc/emqx.conf b/etc/emqx.conf
index ca5786320..54a3eff6f 100644
--- a/etc/emqx.conf
+++ b/etc/emqx.conf
@@ -1885,6 +1885,7 @@ broker.session_locking_strategy = quorum
 ## Value: Enum
 ## - random
 ## - round_robbin
+## - sticky
 ## - hash
 broker.shared_subscription_strategy = random