diff --git a/README.md b/README.md
index ae0419ed..cd5d37ed 100644
--- a/README.md
+++ b/README.md
@@ -220,6 +220,17 @@ jobs:
 
 Once the docs build is complete in your project, you can drop that change.
 
+## Development docs
+
+To test `doc-builder` changes locally, use the `dummy/` folder. It contains a minimal setup for manual testing. Don't commit your changes in `dummy/` since it's only for local development.
+
+Run a preview with:
+```bash
+doc-builder preview dummy dummy --not_python_module
+```
+
+Documentation page should be available at `http://localhost:5173/index`.
+
 ## Development Commands
 
 Since we've modernized the tooling to use `ruff` and `uv`, here are the commands for development:
diff --git a/dummy/_toctree.yml b/dummy/_toctree.yml
new file mode 100644
index 00000000..db985835
--- /dev/null
+++ b/dummy/_toctree.yml
@@ -0,0 +1,4 @@
+- title: 'Get started'
+  sections:
+    - local: index
+      title: Home
\ No newline at end of file
diff --git a/dummy/index.md b/dummy/index.md
new file mode 100644
index 00000000..a13e39cb
--- /dev/null
+++ b/dummy/index.md
@@ -0,0 +1,13 @@
+# Dummy docs
+
+This is a dummy doc page. You can add anything to it and then run
+
+```bash
+doc-builder preview dummy dummy --not_python_module
+```
+
+Documentation page should be available at `http://localhost:5173/index`.
+
+Use this page as a playground to test new features developed in `doc-builder`.
+
+**Please do not commit changes on this file.**