diff --git a/src/modules/nathelper/README b/src/modules/nathelper/README
index 048372ae96f..7cafc186031 100644
--- a/src/modules/nathelper/README
+++ b/src/modules/nathelper/README
@@ -273,11 +273,11 @@ modparam("nathelper", "natping_interval", 10)
 
 4.3. ping_nated_only (integer)
 
-   If this parameter is set to 1 then only contacts that have “behind_NAT”
-   flag in user location database set will get ping.
+   If this parameter is set to 1 then only contacts that have the behind
+   NAT “nat_bflag” flag in user location database set will get ping.
 
-   If it is 0 and sipping_flag is not set, then the 4-bytes UDP ping is
-   sent to all contacts. If it is 0 and sipping_flag parameter is set,
+   If it is 0 and sipping_bflag is not set, then the 4-bytes UDP ping is
+   sent to all contacts. If it is 0 and sipping_bflag parameter is set,
    then SIP-request-based pinging is sent to all contacts.
 
    Default value is 0.