diff --git a/semaphore/docker-compose.yml b/semaphore/docker-compose.yml
index 18e7e4e..8729d7b 100644
--- a/semaphore/docker-compose.yml
+++ b/semaphore/docker-compose.yml
@@ -1,4 +1,6 @@
-version: "3.8"
+#
+# https://semaphoreui.com/install/docker/2_12
+#
 
 services: