diff --git a/guestbook/guestbook-ui-deployment.yaml b/guestbook/guestbook-ui-deployment.yaml
index 8a0975e..d96109b 100644
--- a/guestbook/guestbook-ui-deployment.yaml
+++ b/guestbook/guestbook-ui-deployment.yaml
@@ -2,6 +2,8 @@ apiVersion: apps/v1
 kind: Deployment
 metadata:
   name: guestbook-ui
+  labels:
+    branch: ARGOCD_APP_SOURCE_TARGET_REVISION
 spec:
   replicas: 1
   revisionHistoryLimit: 3