diff --git a/README.md b/README.md
index 84cd860..0d59e12 100644
--- a/README.md
+++ b/README.md
@@ -20,6 +20,8 @@ information on your site to be discovered by Google quickly.
 Therefore, all Silverstripe websites contain a special controller which can 
 be visited: http://yoursite.com/sitemap.xml
 
+Flush this route to ensure the changes take effect with: http://yoursite.com/sitemap.xml?flush=1
+
 See http://en.wikipedia.org/wiki/Sitemaps for info on this format.
 
 ## Usage Overview