diff --git a/docs/string.md b/docs/string.md
index 1e98079..50769ba 100644
--- a/docs/string.md
+++ b/docs/string.md
@@ -356,7 +356,7 @@ r.sticky // true
 
 ```
 
-## Regexp.escape
+## Regexp.escape()
 
 字符串必须转义，才能作为正则模式。