diff --git a/docs/mdev.txt b/docs/mdev.txt
index b24025f7b..b13a0bb93 100644
--- a/docs/mdev.txt
+++ b/docs/mdev.txt
@@ -60,9 +60,9 @@ or
 For example:
 	hd[a-z][0-9]* 0:3 660
 
-The config file parsing stops at the first matching line.  If no line is
-matched, then the default of 0:0 660 is used.  To set your own default, simply
-create your own total match like so:
+The config file parsing stops at the first matching line unless this line
+starts with "-". If no line is matched, then the default of 0:0 660 is used.
+To set your own default, simply create your own total match like so:
 
 	.* 1:1 777