diff --git a/README.md b/README.md
index 4dcf462..4a60ac9 100644
--- a/README.md
+++ b/README.md
@@ -4,3 +4,6 @@ Android app to show your Nextcloud Maps geobookmarks list. Geobookmarks can be o
 A new geobookmark can be created on current location.
 
 **Requires Maps app to be installed on the Nextcloud instance.**
+
+This work is heavily based on [matiasdelellis's Nextcloud SSO example](https://github.com/matiasdelellis/app-tutorial-android) to implement [Nextcloud single sign on](https://github.com/nextcloud/Android-SingleSignOn).
+