diff --git a/deployment/ocelot-social/mailserver/README.md b/deployment/ocelot-social/mailserver/README.md
index 9a224a3b9..dcbc97d2b 100644
--- a/deployment/ocelot-social/mailserver/README.md
+++ b/deployment/ocelot-social/mailserver/README.md
@@ -1,7 +1,7 @@
 # Development Mail Server
 
 You can deploy a fake smtp server which captures all send mails and displays
-them in a web interface. The [sample configuration](../templates/configmap.template.yml)
+them in a web interface. The [sample configuration](../templates/configmap.template.yaml)
 is assuming such a dummy server in the `SMTP_HOST` configuration and points to
 a cluster-internal SMTP server.