diff --git a/README.md b/README.md
index 4e00073d2..ade3a8306 100755
--- a/README.md
+++ b/README.md
@@ -315,7 +315,7 @@ Reference
 
   * [v::tld()](#vtld)
   * [v::countryCode()](#vcountrycode)
-  * [v::postalCode()](#vpostalcode)
+  * [v::postalCode()](#vpostalcodestring-countrycode)
 
 ### Files
 
@@ -1632,7 +1632,7 @@ See also:
 
   * [v::negative()](#vnegative)
 
-#### v::postalCode($countryCode)
+#### v::postalCode(string $countryCode)
 
 Validates a postal code according to the given country code.
 
diff --git a/library/Validator.php b/library/Validator.php
index e57acebee..a7c8746e7 100644
--- a/library/Validator.php
+++ b/library/Validator.php
@@ -72,7 +72,7 @@
  * @method static Validator perfectSquare()
  * @method static Validator phone()
  * @method static Validator positive()
- * @method static Validator postalCode($countryCode)
+ * @method static Validator postalCode(string $countryCode)
  * @method static Validator primeNumber()
  * @method static Validator prnt(string $additionalChars = null)
  * @method static Validator punct(string $additionalChars = null)