diff --git a/Hook-Rules.md b/Hook-Rules.md
index d63d321..ac07001 100644
--- a/Hook-Rules.md
+++ b/Hook-Rules.md
@@ -109,6 +109,7 @@ There are three different match rules:
 ```
 
 ### 2. Match regex
+For the regex syntax, check out <http://golang.org/pkg/regexp/syntax/>
 ```json
 {
   "match":