diff --git a/book/source/index.md b/book/source/index.md
new file mode 100644
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--- /dev/null
+++ b/book/source/index.md
@@ -0,0 +1,18 @@
+# Notes on OpenPGP, for application developers
+
+```{toctree}
+:numbered:
+:maxdepth: 3
+:glob:
+
+*
+```
+
+<!---
+Indices and tables
+==================
+
+* :ref:`genindex`
+* :ref:`modindex`
+* :ref:`search`
+--->
\ No newline at end of file
diff --git a/book/source/index.rst b/book/source/index.rst
deleted file mode 100644
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--- a/book/source/index.rst
+++ /dev/null
@@ -1,17 +0,0 @@
-Notes on OpenPGP, for application developers
-============================================
-
-.. toctree::
-   :numbered:
-   :maxdepth: 3
-   :glob:
-
-   *
-
-
-Indices and tables
-==================
-
-* :ref:`genindex`
-* :ref:`modindex`
-* :ref:`search`