diff --git a/src/phputf8/utils/validation.php b/src/phputf8/utils/validation.php
index d050a165..2893f2e1 100644
--- a/src/phputf8/utils/validation.php
+++ b/src/phputf8/utils/validation.php
@@ -1,6 +1,6 @@
 <?php
 /**
-* Tools for validing a UTF-8 string is well formed.
+* Tools for validating a UTF-8 string is well formed.
 * The Original Code is Mozilla Communicator client code.
 * The Initial Developer of the Original Code is
 * Netscape Communications Corporation.