diff --git a/docs/ref/contrib/messages.txt b/docs/ref/contrib/messages.txt
index ceead9d23c..22f6bd0496 100644
--- a/docs/ref/contrib/messages.txt
+++ b/docs/ref/contrib/messages.txt
@@ -183,6 +183,10 @@ If you're using the context processor, your template should be rendered with a
 ``RequestContext``. Otherwise, ensure ``messages`` is available to
 the template context.
 
+Even if you know there is only just one message, you should still iterate over
+the ``messages`` sequence, because otherwise the message storage will not be cleared
+for the next request.
+
 Creating custom message levels
 ------------------------------