diff --git a/roles/custom/matrix-sliding-sync/defaults/main.yml b/roles/custom/matrix-sliding-sync/defaults/main.yml
index 7b17b9b1d..c3c15da2f 100644
--- a/roles/custom/matrix-sliding-sync/defaults/main.yml
+++ b/roles/custom/matrix-sliding-sync/defaults/main.yml
@@ -1,6 +1,7 @@
 ---
 
 # Sliding Sync Proxy is an implementation of MSC3575 for the new sliding sync
+# Project source code URL: https://github.com/matrix-org/sliding-sync
 
 matrix_sliding_sync_enabled: true