diff --git a/ChangeLog b/ChangeLog
index 2a6b5733..45d3ad99 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -44,6 +44,10 @@ releases.
 * New Actions:
     - `action.d/npf.conf` for NPF, the latest packet filter for NetBSD
 
+* New Filters:
+    - `filter.d/mongodb-auth.conf` for MongoDB (document-oriented NoSQL database engine)
+
+
 ### Enhancements
 * DateTemplate regexp extended with the word-end boundary, additionally to 
   word-start boundary
diff --git a/config/jail.conf b/config/jail.conf
index 0778a318..4d9f3345 100644
--- a/config/jail.conf
+++ b/config/jail.conf
@@ -731,8 +731,9 @@ logpath  = %(mysql_log)s
 backend  = %(mysql_backend)s
 
 
-# Log wrong MongoDB auth (for details how ... see filter ...)
+# Log wrong MongoDB auth (for details see filter 'filter.d/mongodb-auth.conf')
 [mongodb-auth]
+# change port when running with "--shardsvr" or "--configsvr" runtime operation
 port     = 27017
 logpath  = /var/log/mongodb/mongodb.log