diff --git a/string.php b/string.php
index 4b5c8c3..2a4ef70 100644
--- a/string.php
+++ b/string.php
@@ -7,7 +7,8 @@ function umlaute($str) {
           'ä',
           'ö',
           'ü',
-          'ß'
+          'ß',
+          '&'
   ), array (
           'Ä',
           'Ö',
@@ -15,7 +16,8 @@ function umlaute($str) {
           'ä',
           'ö',
           'ü',
-          'ß'
+          'ß',
+          '&'
   ), $str );
 }
 function chk($str) {