README.md in contexto-0.4.0 vs README.md in contexto-0.4.1

@@ -57,10 +57,13 @@
 3. ssh
 4. nah
 Please choose a connection type?
 ```
 
-You can get Contexto to connect via SSH to a Bash shell, or a Rails console.
+You can get Contexto to connect via SSH to a Bash shell, or a Rails
+console. If you're using SSH you'll need to add a key allowing access to
+the specific ECS hosts. This is usually the key used when you created
+the cluster.
 
 You can also specify a cluster and service to take a shortcut to a
 specific set of containers.
 
 ```bash