diff --git a/config-dist.php b/config-dist.php
index 2ab5be73c1fa1..8563a5a918452 100644
--- a/config-dist.php
+++ b/config-dist.php
@@ -138,6 +138,11 @@
 // This is especially useful for demonstration teacher accounts
 //      $CFG->restrictusers = 'teacher,fred,jim';
 //
+// Turning this on will make Moodle filter more than usual, including
+// forum subjects, activity names and so on (in ADDITION to the normal 
+// texts like forum postings, journals etc).  This is mostly only useful 
+// when using the multilang filter.   This feature may not be complete.
+//      $CFG->filterall = true;