Update README.md

fix typo

examples/rocketchat/README.md

@@ -1,3 +1,20 @@
 # References
 
 - https://github.com/RocketChat/Docker.Official.Image
+
+# Notes
+
+The mongodb container will likely throw a permission error when being started for the first time.
+
+````
+error: 'An error occurred when creating an index for collection "users: getaddrinfo EAI_AGAIN mongodb',
+  reason: undefined,
+  details: undefined,
+  errorType: 'Meteor.Error'
+````
+
+Therefore, you have to adjust the permissions of the mongodb volume path. For example with the following command:
+
+````
+sudo chmod -R 777 /mnt/docker-volumes/rocketchat
+````

examples/rocketchat/docker-compose.yml

@@ -17,6 +17,8 @@ services:
     #  - traefik.http.routers.rocketchat.middlewares=local-ipwhitelist@file
     #networks:
     #  - proxy
+    volumes:
+      - ${DOCKER_VOLUME_STORAGE:-/mnt/docker-volumes}/rocketchat/uploads:/app/uploads # only use if you enable filesystem upload in the admin area; see https://docs.rocket.chat/use-rocket.chat/workspace-administration/settings/file-upload#storage-type
     environment:
       MONGO_URL: "${MONGO_URL:-\
         mongodb://${MONGODB_ADVERTISED_HOSTNAME:-mongodb}:${MONGODB_INITIAL_PRIMARY_PORT_NUMBER:-27017}/\