diff --git a/readme.md b/readme.md
index 63b9c16..aa7d541 100644
--- a/readme.md
+++ b/readme.md
@@ -207,11 +207,11 @@ The example folder `./example` will be available as ` \\host.lan\Data`.
 
 ### How do I set the product key?
 
-  By default, an evaluation version of Windows will be installed, but if you have product key you can add a `KEY` variable like this (before installation):
+  By default, an evaluation version of Windows will be installed, but if you have a product key you can add a `KEY` variable like this (before installation):
 
   ```yaml
   environment:
-    KEY: "XXXXX-XXXXX-XXXXX-XXXXX-XXXXX"
+    KEY: "xxxxx-xxxxx-xxxxx-xxxxx-xxxxx"
   ```
 
 ### How do I install a custom image?