diff --git a/docs/source/settings.rst b/docs/source/settings.rst
index 74b2dd7b..e1e91fa7 100644
--- a/docs/source/settings.rst
+++ b/docs/source/settings.rst
@@ -200,7 +200,7 @@ Identifier   Description
 ===========  ===========
 h            remote address
 l            ``'-'``
-u            user name
+u            user name (if HTTP Basic auth used)
 t            date of the request
 r            status line (e.g. ``GET / HTTP/1.1``)
 m            request method