diff --git a/readme.md b/readme.md
index cf6707b..e073416 100644
--- a/readme.md
+++ b/readme.md
@@ -129,7 +129,7 @@ docker run -it --rm -p 8006:8006 --device=/dev/kvm --cap-add NET_ADMIN --stop-ti
 
 * ### How do I install a custom image?
 
-  In order to download a custom ISO image, start a clean container with the URL specified in the `VERSION` environment variable:
+  In order to download a custom ISO image, start a clean container with the URL of the ISO specified in the `VERSION` environment variable:
   
   ```yaml
   environment: