diff --git a/src/MessageFormatter.php b/src/MessageFormatter.php
index 5f0cb6f7..6b090a97 100644
--- a/src/MessageFormatter.php
+++ b/src/MessageFormatter.php
@@ -37,7 +37,7 @@ class MessageFormatter
 {
     /**
      * Apache Common Log Format.
-     * @link http://httpd.apache.org/docs/1.3/logs.html#common
+     * @link http://httpd.apache.org/docs/2.4/logs.html#common
      * @var string
      */
     const CLF = "{hostname} {req_header_User-Agent} - [{date_common_log}] \"{method} {target} HTTP/{version}\" {code} {res_header_Content-Length}";