diff --git a/1.0/docker-compose.yml b/1.0/docker-compose.yml
index 5aaeb6c..3ff6b50 100644
--- a/1.0/docker-compose.yml
+++ b/1.0/docker-compose.yml
@@ -13,3 +13,4 @@ services:
 #      - UPDATE_MODS_ON_START=true
 #      - USERNAME=FactorioUsername
 #      - TOKEN=FactorioToken
+#      - PORT=34198
diff --git a/README.md b/README.md
index afdca7e..be2f9f3 100644
--- a/README.md
+++ b/README.md
@@ -312,7 +312,7 @@ sudo docker-compose up -d
 
 ### Ports
 
-* `34197/udp` - Game server (required).
+* `34197/udp` - Game server (required). This can be changed with the `PORT` environment variable.
 * `27015/tcp` - RCON (optional).
 
 ## LAN Games