diff --git a/rg-header.el b/rg-header.el
index e8915a4..a5389ef 100644
--- a/rg-header.el
+++ b/rg-header.el
@@ -34,10 +34,10 @@
 
 
 ;; Customization
-(defcustom rg-header-max-search-string-length 50
+(defcustom rg-header-max-search-string-length nil
   "The max line length of header line search string item."
   :type '(choice (const :tag "Don't truncate" nil)
-                 number)
+                 (number :tag "The max width"))
   :group 'rg)