diff --git a/libraries/string.lib.php b/libraries/string.lib.php
index 6e92ffc4c..694c2e7d9 100644
--- a/libraries/string.lib.php
+++ b/libraries/string.lib.php
@@ -362,7 +362,7 @@ function PMA_STR_isSqlIdentifier($c, $dot_is_valid = FALSE)
  */
 function PMA_STR_binarySearchInArr($str, $arr, $arrsize)
 {
-    // $arr NUST be sorted, due to binary search
+    // $arr MUST be sorted, due to binary search
     $top    = $arrsize - 1;
     $bottom = 0;
     $found  = FALSE;