diff --git a/README.md b/README.md
index 997c5e2..c6dd946 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,8 @@
 - app: [![Build Status](https://jenkins.pgollor.de/job/nextcloud-docker-app/badge/icon)](https://jenkins.pgollor.de/job/nextcloud-docker-app-dev/) [![](https://images.microbadger.com/badges/image/pgollor/nextcloud:app-dev-latest.svg)](https://microbadger.com/images/pgollor/nextcloud:app-dev-latest "Get your own image badge on microbadger.com") [![](https://images.microbadger.com/badges/version/pgollor/nextcloud:app-dev-latest.svg)](https://microbadger.com/images/pgollor/nextcloud:app-dev-latest "Get your own version badge on microbadger.com") [![based on nextcloud-version](https://img.shields.io/badge/dynamic/json.svg?label=based%20on&url=https%3A%2F%2Fapi.microbadger.com%2Fv1%2Fimages%2Fpgollor%2Fnextcloud%3Aapp-dev-latest&query=%24.Labels.nv&colorB=brightgreen&prefix=nextcloud-)](https://hub.docker.com/_/nextcloud/)
 - web: [![Build Status](https://jenkins.pgollor.de/job/nextcloud-docker-web/badge/icon)](https://jenkins.pgollor.de/job/nextcloud-docker-web/) [![](https://images.microbadger.com/badges/image/pgollor/nextcloud:web-latest.svg)](https://microbadger.com/images/pgollor/nextcloud:web-latest "Get your own image badge on microbadger.com") [![](https://images.microbadger.com/badges/version/pgollor/nextcloud:web-latest.svg)](https://microbadger.com/images/pgollor/nextcloud:web-latest "Get your own version badge on microbadger.com")
 
-Docker compose files for nextcloud
+Docker compose files for nextcloud with database and redis container.
+This compose set is designed fo rusing behing a revers proxy which handels the ssl certificates.
 
 
 ## Information
@@ -19,6 +20,10 @@
 
 ## Update hints
 
+### 20 to 21
+
+All containers and volumes are renamed. Make a full backup and restore it. Untestet now!
+
 ### 14.0.4 to 14.0.16
 
 If you get a database error for the `activity` table, please have a look at this [issue](https://github.com/nextcloud/activity/issues/309#issuecomment-436929111).