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README.md

@@ -31,7 +31,7 @@ To test it locally:
 1. Install the required tools (See also [.github/workflows/build-docs.yaml](.github/workflows/build-docs.yaml)):
     ```
     pip install --upgrade pip
-    pip install mkdocs mkdocs-gen-files mkdocs-awesome-pages-plugin mkdocs-material
+    pip install mkdocs mkdocs-gen-files mkdocs-awesome-pages-plugin mkdocs-material pymdown-extensions
     ```
 1. In the main folder of the repo, call `mkdocs serve` (and keep it running).
   This will locally generate the documentation.