diff --git a/.github/workflows/nix.yml b/.github/workflows/nix.yml
index 3dd3b0c..4fc4fc4 100644
--- a/.github/workflows/nix.yml
+++ b/.github/workflows/nix.yml
@@ -9,7 +9,6 @@ on:
   schedule:
     - cron: '0 1 * * *'
 
-
 jobs:
   nix-build-unstable:
     runs-on: ubuntu-latest
@@ -21,6 +20,11 @@ jobs:
           nix_path: nixpkgs=channel:nixos-unstable
       - name: Checkout
         uses: actions/checkout@v3
+      - uses: cachix/cachix-action@v14
+        with:
+          name: gh-harmony
+          # If you chose API tokens for write access OR if you have a private cache
+          authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
       - name: Build
         run: nix build
 
diff --git a/README.md b/README.md
index fb5d6ba..69388d1 100644
--- a/README.md
+++ b/README.md
@@ -46,6 +46,11 @@ You can add Harmony to your Flake inputs as follows:
 
 Then, in your outputs, bring Harmony into a package install list as `harmony.packages.<system>.harmony`.
 
+Harmony builds are cached in Cachix so you can take advantage of those builds by
+adding `gh-harmony.cachix.org` to the list of `substituters` and
+`gh-harmony.cachix.org-1:KX5tTtEt3Y6an8pywe3Cy6jR9bUo+1Cl7hJmh+5eI4I=` to the
+list of `trusted-public-keys`.
+
 ### From Source
 The build script assumes a HEAD build of Idris 2 is installed on your system. For an alternative, see the [Docker Build](#docker-build) instructions below.