Update README

Author: alexdenvir

README.md

@@ -172,7 +172,10 @@ Installing private repositories
 
 To install from a private repository, SSH authentication must be used. Generate an SSH key pair for this purpose and add it to your private repository's configuration, preferable with only read-only privileges. On Github for instance, this can be done by using [deploy keys][deploy-keys]. 
 
-Add the key pair to your project using  [Github Secrets][secrets], and pass them into the `php-actions/composer` action by using the `ssh_key` and `ssh_key_pub` inputs. If your private repository is stored on another server than github.com, you also need to pass the domain via `ssh_domain`.
+Add the key pair to your project using  [Github Secrets][secrets], and pass them into the `php-actions/composer` action by using the 
+`ssh_key` and `ssh_key_pub` inputs. If your private repository is stored on another server than github.com, you also need to pass the 
+domain via `ssh_domain`. If the private repository is configured to use a non-standard SSH port, you can configure this by passed 
+`ssh_port`.
 
 Example yaml, showing how to pass secrets: