diff --git a/CONTRIBUTING.rst b/CONTRIBUTING.rst
index 50d20cbb4..117d3f6d2 100644
--- a/CONTRIBUTING.rst
+++ b/CONTRIBUTING.rst
@@ -1,4 +1,4 @@
 Contributing code to Riot iOS
 ==================================
 
-riot-ios follows the same pattern as https://github.com/matrix-org/synapse/blob/master/CONTRIBUTING.rst
+riot-ios follows the same pattern as https://github.com/matrix-org/synapse/blob/master/CONTRIBUTING.md