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README.md

@@ -10,8 +10,28 @@ a GitHub action to install (pre-release) pythons from [deadsnakes]
 ### using this action
 
 To use this action, add it adjacent to `setup-python` and opt into it
-conditionally.  Here's an example which uses `python` as a matrix.
+conditionally.  Here's an example which uses `python-version` as a matrix.
 
 ```yaml
-TODO!!!!
+on:
+  push:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: [3.6, 3.7, 3.8, 3.9-dev]
+    name: main
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-python@v2
+        if: matrix.python-version != '3.9-dev'
+        with:
+          python-version: ${{ matrix.python-version }}
+      - uses: deadsnakes/[email protected]
+        if: matrix.python-version == '3.9-dev'
+        with:
+          python-version: ${{ matrix.python-version }}
+      - run: python --version --version && which python
 ```