From 12e22d4e749e4225f60101dbb95a305f37022991 Mon Sep 17 00:00:00 2001
From: Steve Purcell <steve@sanityinc.com>
Date: Wed, 16 Aug 2023 18:44:06 +1200
Subject: [PATCH] Show how to limit the systems for which matrix entries are
 generated

---
 README.md | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/README.md b/README.md
index b2a38e46..54446e95 100644
--- a/README.md
+++ b/README.md
@@ -60,3 +60,14 @@ $ nix run github:nix-community/nix-github-actions
   };
 }
 ```
+
+#### When your Flake supports systems that GitHub Actions does not
+
+If your Flake contains checks for platforms unsupported by Actions, e.g. `aarch64-darwin`,
+you can restrict the systems for which the matrix will be generated:
+
+``` nix
+githubActions = nix-github-actions.lib.mkGithubMatrix {
+  checks = nixpkgs.lib.getAttrs [ "x86_64-linux" "x86_64-darwin" ] self.checks;
+};
+```