diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
index af67860..293ee1c 100644
--- a/.github/workflows/rust.yml
+++ b/.github/workflows/rust.yml
@@ -39,8 +39,20 @@ jobs:
       run: |
         min_version="$(docker run --rm -t -v "$PWD/":/app/ foresterre/cargo-msrv find --no-log --output-format minimal)"
         echo "result=$min_version" >> "$GITHUB_OUTPUT"
-    - name: echo
-      run: echo ${{ steps.run-msrv.outputs.result }}
+    - name: find version mentioned in readme
+      id: readme-version
+      run: |
+        readme_version="$(cat README.md | cargo run -- '# Development | P: "Requires rustc >=" ' | awk '{print $NF}')"
+        echo "result=$readme_version" >> "$GITHUB_OUTPUT"
+    - name: compare versions
+      run: |
+        if [[ "$MSRV_VERSION" != "$README_VERSION" ]]; then
+          echo "::error title=msrv-mismatch::cargo-msrv was $MSRV_VERSION but README.md says rustc >= $README_VERSION"
+          exit 1
+        fi
+      env:
+        MSRV_VERSION: ${{ steps.run-msrv.outputs.result }}
+        README_VERSION: ${{ steps.readme-version.outputs.result }}
 
   check:
     runs-on: ubuntu-latest
diff --git a/README.md b/README.md
index f44fe01..0d23b28 100644
--- a/README.md
+++ b/README.md
@@ -177,3 +177,15 @@ cat oncall.md | mdq ':-: * :-: 2024-01-15'
 |:----------:|:-----:|:---:|:---:|----:|
 | 2024-01-15 |       |     |  x  |     |
 ```
+
+# Development
+
+Requires rustc >= 1.20.0
+
+```bash
+cargo build
+```
+
+```bash
+cargo test
+```