diff --git a/README.md b/README.md
index f5dc9af2ad..cd2898ed40 100644
--- a/README.md
+++ b/README.md
@@ -65,6 +65,8 @@ docker run \
 ```
 with any additional options you desire (i.e. You'll have to expose more game ports in order to host more than one instance).
 
+- Important note about port exposure: The internal port used by DreamDaemon _**MUST**_ match the port you want users to connect on. If it doesn't, you'll still be able to have them connect HOWEVER links from the BYOND hub will point at what DreamDaemon thinks the port is.
+
 Note although `/app/lib` is specified as a volume mount point in the `Dockerfile`, unless you REALLY know what you're doing. Do not mount any volumes over this for fear of breaking your container.
 
 The configuration option `General:ValidInstancePaths` will be preconfigured to point to `/tgs4_instances`. It is recommended you don't change this.