diff --git a/docker-build/README.docker b/docker-build/README.docker
index 9c3cbe693..44a031344 100644
--- a/docker-build/README.docker
+++ b/docker-build/README.docker
@@ -1,6 +1,6 @@
 
 # Build, execute from the repository root 
-`docker buildx build -t hamlib-runtime -f docker-build/Dockerfile .`
+`docker buildx build --platform linux/amd64,linux/arm64 -t hamlib-runtime -f docker-build/Dockerfile .`
 
 # Run the hamlib-runtime
 `docker run -it hamlib-runtime bash`