diff --git a/Documentation.html b/Documentation.html
index 3c1242475..7f19ebb21 100644
--- a/Documentation.html
+++ b/Documentation.html
@@ -3368,7 +3368,7 @@ have either the <a href="http://pecl.php.net/package/APC">APC</a> extension
 
 <h4 id="login_bug">
     <a href="#login_bug">3.1 When using
-    <abbr title="HyperText Transfer Protocol">HTTP</abbr> authentication, an user
+    <abbr title="HyperText Transfer Protocol">HTTP</abbr> authentication, a user
     who logged out can not log in again in with the same nick.</a></h4>
 
 <p> This is related to the authentication mechanism (protocol) used by