Bot Updating Documentation

docs/images/docker-ddclient.md

@@ -44,6 +44,14 @@ If ddclient shall fetch the dynamic (public) IP-address from a fritz.box (AVM) a
 use=cmd, cmd=/etc/ddclient/get-ip-from-fritzbox
 ````
 
+## Read-Only Operation
+
+This image can be run with a read-only container filesystem. For details please [read the docs](https://docs.linuxserver.io/misc/read-only/).
+
+### Caveats
+
+`/tmp` must also be mounted to tmpfs for this image.
+
 ## Usage
 
 To help you get started creating a container from this image you can either use docker-compose or the docker cli.