diff --git a/README.md b/README.md
index 0159e34..9a50574 100644
--- a/README.md
+++ b/README.md
@@ -22,6 +22,11 @@ The `src/Before/` folder contains a small domain model (Client, Order) backed by
    ```
    dotnet build
    ```
+4. On windows: npm install @mermaid-js/mermaid-cli (global install failed)
+5. Verify mermaid runs
+   ```
+   ./node-modules/.bin/mmdc
+   ```
 
 ## Tasks