diff --git a/README.md b/README.md
index 95aa194..78f5ab0 100644
--- a/README.md
+++ b/README.md
@@ -141,7 +141,7 @@ Input:
 , # maps to the devShell output. Pass in a shell.nix file or function.
   shell ? null
 , # pass the list of supported systems
-  systems ? [ system.x86_64-linux ]
+  systems ? [ "x86_64-linux" "aarch64-linux" "x86_64-darwin" "aarch64-darwin" ]
 }: null
 ```