diff --git a/dev-overlay.yml b/dev-overlay.yml
index d93dfe3..66a399f 100644
--- a/dev-overlay.yml
+++ b/dev-overlay.yml
@@ -6,7 +6,7 @@ services:
     user: ${USERID}
     working_dir: /var/workspace
     environment:
-            HOME: "/tmp"
+            HOME: "/tmp" # This is needed so npm can create the cache at the default location ~/.npm
     volumes:
       - ${DEV_OVERLAY_DIR}:/var/workspace/:cached
     ports: