@@ -71,6 +71,14 @@ cd haskell.nix
7171nix build -f . haskell-nix.nix-tools --out-link nt
7272```
7373
74+## Setting up the Cachix binary cache
75+
76+CI pushes to [cachix](https://cachix.org) so you can benefit from the cache if
77+you pin a combination of `haskell.nix` and `nixpkgs` built by CI. You'll need
78+to configure the [nix-tools cachix](https://nix-tools.cachix.org) as a
79+`substituter` for `nix` and add the public key found at the url to
80+`trusted-public-keys`.
81+
7482## Using [Haskell.nix][] with your project
7583
7684The easiest way to get a hold of [Haskell.nix][] is with