Add warning regarding config upgrade in docker.md

diff --git a/support/doc/docker.md b/support/doc/docker.md
index c20746486413b0e122c714bf46825df491c5ea8a..7b2d867a0dd8cd088dc969647c2610de6e21f6f3 100644 (file)
--- a/support/doc/docker.md
+++ b/support/doc/docker.md
@@ -59,6 +59,8 @@ See the production guide ["What now" section](/support/doc/production.md#what-no
 
 ### Upgrade
 
+**Important:** Before upgrading, check you have all the `storage` fields in your [production.yaml file](/support/docker/production/config/production.yaml). 
+
 Pull the latest images and rerun PeerTube:
 
 ```shell
@@ -67,7 +69,6 @@ $ docker-compose pull
 $ docker-compose up -d
 ```
 
-
 ## Build your own Docker image
 
 ```shell