diff --git a/readme.md b/readme.md
index fdcbf18..be1a38a 100644
--- a/readme.md
+++ b/readme.md
@@ -28,7 +28,6 @@ Windows in a Docker container.
 Via Docker Compose:
 
 ```yaml
-version: "3"
 services:
   windows:
     image: dockurr/windows