diff --git a/Shorewall/Perl/Shorewall/Chains.pm b/Shorewall/Perl/Shorewall/Chains.pm
index 30b3f928c..832a7330f 100644
--- a/Shorewall/Perl/Shorewall/Chains.pm
+++ b/Shorewall/Perl/Shorewall/Chains.pm
@@ -950,7 +950,9 @@ sub compatible( $$ ) {
 	    }
 	}
     }
-
+    #
+    # Don't combine chains where each specifies '-m policy'
+    #
     return ! ( $ref1->{policy} && $ref2->{policy} );
 }