diff --git a/argocd/apps/mattermost/mattermnost.yaml b/argocd/apps/mattermost/mattermnost.yaml
index 4b6b64f..35a5900 100644
--- a/argocd/apps/mattermost/mattermnost.yaml
+++ b/argocd/apps/mattermost/mattermnost.yaml
@@ -32,6 +32,14 @@ spec:
           value: 'false'
         - name: sharedDataFolder.storageClass
           value: local-path
+        - name: externalDatabase.host
+          value: mm-postgresql.mattermost-operator.svc.cluster.local
+        - name: externalDatabase.user
+          value:  postgres
+        - name: externalDatabase.password
+          value: SCvSs9l9UK
+        - name: externalDatabase.name
+          value: postgres
     chart: mattermost-operator
   destination:
     server: 'https://kubernetes.default.svc'