diff --git a/semaphore/.env b/semaphore/.env
index d04d130..9cd24aa 100644
--- a/semaphore/.env
+++ b/semaphore/.env
@@ -46,3 +46,8 @@ SEMAPHORE_OIDC_ADMIN_USERS=admin@example.com
 # The scope to request from the OpenID provider.
 # "openid" and "email" are standard. You may need more depending on your provider.
 SEMAPHORE_OIDC_SCOPE=openid email
+
+# --- Docker Compose Variables ---
+# The host port you want to expose. The container's port is fixed at 3000.
+SEMAPHORE_PORT_HOST=3000
+POSTGRES_VOLUME_NAME=postgres-data
\ No newline at end of file