diff --git a/README.md b/README.md
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@@ -1,5 +1,15 @@
 # BASICMATT Docker Container
 
+## Prep
+
+Run something like:
+
+```
+export BASIC_MATT_DOCKER_MOUNT_PATH="/Users/matthuntington/Downloads"
+```
+
+to set what host dir is being mounted within the container
+
 ## Commands
 
 Build/Start