diff --git a/roles/matrix-bridge-mautrix-hangouts/defaults/main.yml b/roles/matrix-bridge-mautrix-hangouts/defaults/main.yml
index b23a12fa..01ada495 100644
--- a/roles/matrix-bridge-mautrix-hangouts/defaults/main.yml
+++ b/roles/matrix-bridge-mautrix-hangouts/defaults/main.yml
@@ -3,6 +3,7 @@
 
 matrix_mautrix_hangouts_enabled: true
 
+# See: https://mau.dev/tulir/mautrix-hangouts/container_registry
 matrix_mautrix_hangouts_docker_image: "dock.mau.dev/tulir/mautrix-hangouts:latest"
 matrix_mautrix_hangouts_docker_image_force_pull: "{{ matrix_mautrix_hangouts_docker_image.endswith(':latest') }}"