diff --git a/.github/workflows/gradle.yml b/.github/workflows/gradle.yml
index 638a4ccb..2800728d 100644
--- a/.github/workflows/gradle.yml
+++ b/.github/workflows/gradle.yml
@@ -1,21 +1,28 @@
 # This workflow will build a Java project with Gradle
 # For more information see: https://help.github.com/actions/language-and-framework-guides/building-and-testing-java-with-gradle
 
-name: Java CI with Gradle
+name: build
 
 on: [pull_request, push]
 
 jobs:
   build:
-
-    runs-on: ubuntu-latest
-
+    strategy:
+      matrix:
+        # Use these Java versions
+        java: [
+          1.8,  # Minimum supported by Minecraft
+          15    # Latest version
+        ]
+        # and run on both Linux and Windows
+        os: [ubuntu-latest, windows-latest]
+    runs-on: ${{ matrix.os }}
     steps:
     - uses: actions/checkout@v2
-    - name: Set up JDK 1.8
+    - name: Set up JDK ${{ matrix.java }}
       uses: actions/setup-java@v1
       with:
-        java-version: 1.8
+        java-version: ${{ matrix.java }}
     - name: Grant execute permission for gradlew
       run: chmod +x gradlew
     - uses: actions/cache@v2
@@ -27,3 +34,9 @@ jobs:
         restore-keys: ${{ runner.os }}-gradle-
     - name: Build with Gradle
       run: ./gradlew build
+    - name: capture build artifacts
+      if: ${{ runner.os == 'Linux' && matrix.java == '1.8' }}
+      uses: actions/upload-artifact@v2
+      with:
+        name: Artifacts
+        path: build/libs/
diff --git a/README.md b/README.md
index 660b5ccc..ff903e68 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,9 @@
 # OpenComputers II [Working Title]
 
+![build](https://github.com/fnuecke/oc2/workflows/build/badge.svg)
+[![nightly](https://img.shields.io/badge/Builds-nightly-blue)](https://nightly.link/fnuecke/oc2/workflows/build/1.16/Artifacts.zip)
+[![sedna](https://img.shields.io/badge/Requires-OC2%20Sedna-red)](https://nightly.link/fnuecke/oc2-sedna/workflows/build/1.16/Artifacts.zip)
+
 Yet another computer mod.
 
 Nothing is final. Many things will change.