diff --git a/README.md b/README.md
index 3581063..04d48b5 100644
--- a/README.md
+++ b/README.md
@@ -41,6 +41,7 @@ Env var to define :
 DOCKER_USERNAME="Your docker username"
 DOCKER_PASSWORD="Your docker password"
 SSH_HOST="Your SSH host"
+SSH_PORT="Your SSH port" # use port 22 if you are using the default value
 SSH_USERNAME="Your SSH username"
 SSH_KEY="Your SSH key" # see below
 ```