diff --git a/main/pbx.c b/main/pbx.c
index f836419387..ce35e56eff 100644
--- a/main/pbx.c
+++ b/main/pbx.c
@@ -1630,7 +1630,8 @@ static void destroy_pattern_tree(struct match_char *pattern_tree) /* pattern tre
  * Special characters used in patterns:
  *	'_'	underscore is the leading character of a pattern.
  *		In other position it is treated as a regular char.
- *	' ' '-'	space and '-' are separator and ignored.
+ *	' ' '-'	space and '-' are separator and ignored. Why? so
+ *	        patterns like NXX-XXX-XXXX or NXX XXX XXXX will work.
  *	.	one or more of any character. Only allowed at the end of
  *		a pattern.
  *	!	zero or more of anything. Also impacts the result of CANMATCH