diff --git a/conf/be.conf b/conf/be.conf
index 2dc228dc07..455779b2df 100644
--- a/conf/be.conf
+++ b/conf/be.conf
@@ -49,7 +49,7 @@ enable_auth = false
 # Choose one if there are more than one ip except loopback address. 
 # Note that there should at most one ip match this list.
 # If no ip match this rule, will choose one randomly.
-# use CIDR format, e.g. 10.10.10.0/24
+# use CIDR format, e.g. 10.10.10.0/24 or IP format, e.g. 10.10.10.1
 # Default value is empty.
 # priority_networks = 10.10.10.0/24;192.168.0.0/16
 
diff --git a/conf/fe.conf b/conf/fe.conf
index 77e2b6efa5..ae8bbac9e0 100644
--- a/conf/fe.conf
+++ b/conf/fe.conf
@@ -54,7 +54,7 @@ mysql_service_nio_enabled = true
 # Choose one if there are more than one ip except loopback address. 
 # Note that there should at most one ip match this list.
 # If no ip match this rule, will choose one randomly.
-# use CIDR format, e.g. 10.10.10.0/24
+# use CIDR format, e.g. 10.10.10.0/24 or IP format, e.g. 10.10.10.1
 # Default value is empty.
 # priority_networks = 10.10.10.0/24;192.168.0.0/16