diff --git a/.github/workflows/build-inputs.yml b/.github/workflows/build-inputs.yml
index aeaff45..e942c46 100644
--- a/.github/workflows/build-inputs.yml
+++ b/.github/workflows/build-inputs.yml
@@ -36,8 +36,12 @@ on:
         description: 'Kconfig'
         required: false
         default: 'default'
+      zmk:
+        description: 'ZMK'
+        required: false
+        default: 'default'
       merge:
-        description: 'ZMK Merge'
+        description: 'Merge'
         required: false
         default: 'default'
 jobs:
@@ -52,6 +56,7 @@ jobs:
       layers: ${{ steps.process-inputs.outputs.layers }}
       mapping: ${{ steps.process-inputs.outputs.mapping }}
       kconfig: ${{ steps.process-inputs.outputs.kconfig }}
+      zmk: ${{ steps.process-inputs.outputs.zmk }}
       merge: ${{ steps.process-inputs.outputs.merge }}
     steps:
       - name: Process inputs
@@ -70,6 +75,7 @@ jobs:
           set-output "layers" "${{ github.event.inputs.layers }}"
           set-output "mapping" "${{ github.event.inputs.mapping }}"
           set-output "kconfig" "${{ github.event.inputs.kconfig }}"
+          set-output "zmk" "${{ github.event.inputs.zmk }}"
           set-output "merge" "${{ github.event.inputs.merge }}"
   build:
     uses: manna-harbour/zmk-config/.github/workflows/main.yml@31a649e5571b4572d7010561dd3f191922cd9410
@@ -83,4 +89,5 @@ jobs:
       layers: ${{ needs.process-inputs.outputs.layers }}
       mapping: ${{ needs.process-inputs.outputs.mapping }}
       kconfig: ${{ needs.process-inputs.outputs.kconfig }}
+      zmk: ${{ needs.process-inputs.outputs.zmk }}
       merge: ${{ needs.process-inputs.outputs.merge }}
diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 7f9cdb4..8bf2c33 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -29,6 +29,9 @@ on:
       kconfig:
         type: string
         default: '["default"]'
+      zmk:
+        type: string
+        default: '["default"]'
       merge:
         type: string
         default: '["default"]'
@@ -49,6 +52,7 @@ jobs:
         layers: ${{ fromJSON(inputs.layers) }}
         mapping: ${{ fromJSON(inputs.mapping) }}
         kconfig: ${{ fromJSON(inputs.kconfig) }}
+        zmk: ${{ fromJSON(inputs.zmk) }}
         merge: ${{ fromJSON(inputs.merge) }}
     steps:
       - name: Checkout
@@ -140,16 +144,25 @@ jobs:
         run: |
           mkdir -p `dirname "config/${{ env.outboard_to }}"`
           ln -sr ${{ steps.variables.outputs.outboard_chekout_dir }}/${{ env.outboard_from }} config/${{ env.outboard_to }}
-      - name: Generate outboard manifest
+      - name: Generate manifest from outboard
         if: ${{ env.outboard_url_base != '' && env.outboard_revision != '' }}
         run: |
           echo "manifest:\n  remotes:\n    - name: outboard\n      url-base: ${{ env.outboard_url_base }}\n  projects:\n    - name: zmk\n      remote: outboard\n      revision: ${{ env.outboard_revision }}\n      import: app/west.yml\n  self:\n    path: config" > config/west.yml
           cat config/west.yml
-      - name: Copy outboard manifest
+      - name: Copy manifest from outboard
         if: ${{ env.outboard_manifest != '' }}
         run: |
           cp ${{ steps.variables.outputs.outboard_chekout_dir }}/${{ env.outboard_manifest }} config/west.yml
           cat config/west.yml
+      - name: Generate manifest from zmk field
+        if: ${{ matrix.zmk != '' && matrix.zmk != 'default' }}
+        run: |
+          user=`echo ${{ matrix.zmk }} | cut -f 1 -d '/'`
+          repo=`echo ${{ matrix.zmk }} | cut -f 2 -d '/'`
+          branch=`echo ${{ matrix.zmk }} | cut -f 3- -d '/'`
+          remote="$user-$repo"
+          echo "manifest:\n  remotes:\n    - name: $remote\n      url-base: https://github.com/$user\n  projects:\n    - name: zmk\n      remote: $remote\n      repo-path: $repo\n      revision: $branch\n      import: app/west.yml\n  self:\n    path: config" > config/west.yml
+          cat config/west.yml
       - name: Cache
         if: true
         uses: actions/cache@v2
diff --git a/readme.org b/readme.org
index 501b950..ec82073 100644
--- a/readme.org
+++ b/readme.org
@@ -63,6 +63,8 @@ See the Test All workflow files for all supported values for each option.
 
 The ~kconfig~ option can be used to for [[#kconfig-configuration][Kconfig configuration]].  Join multiple lines with ~\n~.
 
+The ~zmk~ option can be used to build from an alternative ZMK branch.  The branch is specified as ~<user>/<repo>/<branch>~.
+
 The ~merge~ option can be used to merge branches into ZMK at build time.  Branches are specified as ~<user>/<repo>/<branch>~.  To merge multiple branches, separate with space.
 
 
@@ -80,7 +82,9 @@ The ~Miryoku Alphas~, ~Miryoku Nav~, ~Miryoku Clipboard~, and ~Miryoku Layers~ o
 
 The ~Kconfig~ option can be used to for [[#kconfig-configuration][Kconfig configuration]].  Join multiple lines with ~\n~.
 
-The ~ZMK Merge~ option can be used to merge branches into ZMK at build time.  Branches are specified as ~<user>/<repo>/<branch>~.  To merge multiple branches, separate with space.
+The ~ZMK~ option can be used to build from an alternative ZMK branch.  The branch is specified as ~<user>/<repo>/<branch>~.
+
+The ~Merge~ option can be used to merge branches into ZMK at build time.  Branches are specified as ~<user>/<repo>/<branch>~.  To merge multiple branches, separate with space.
 
 
 ** Supported Keyboards