diff --git a/README.md b/README.md
index 7b314d2..3fb9578 100644
--- a/README.md
+++ b/README.md
@@ -22,7 +22,7 @@ Commands:
 @grahamcofborg test list of tests
 ```
 
-This will run `nix-build ./nixos/default.nix -A tests.list -A tests.of -A tests.attrs` in
+This will run `nix-build ./nixos/release.nix -A tests.list -A tests.of -A tests.attrs` in
 the nixpkgs checkout. Note: this will only run on x86_64-linux machines.
 
 ### eval