Add update instructions to the README

README.md

@@ -1,6 +1,6 @@
 # Signal TLS Proxy
 
-To run a Signal TLS proxy, you will need a host with a domain name that has ports 80 and 443 available.
+To run a Signal TLS proxy, you will need a host that has ports 80 and 443 available and a domain name that points to that host.
 
 1. Install docker and docker-compose (`apt update && apt install docker docker-compose`)
 1. Ensure your current user has access to docker (`adduser $USER docker`)
@@ -9,3 +9,13 @@ To run a Signal TLS proxy, you will need a host with a domain name that has port
 1. `docker-compose up --detach`
 
 Your proxy is now running! You can share this with the URL `https://signal.tube/#<your_host_name>`
+
+## Updating from a previous version
+
+If you've previously run a proxy, please update to the most recent version by pulling the most recent changes from `main`, then restarting your Docker containers:
+
+```shell
+git pull
+docker-compose down
+docker-compose up --detach
+```