--- a/testing/marionette/doc/index.rst
+++ b/testing/marionette/doc/index.rst
@@ -46,16 +46,17 @@ For developers
 .. toctree::
    :maxdepth: 1
 
    `Contributing to Marionette`_
    NewContributors.md
    Debugging.md
    PythonTests.md
    SeleniumAtoms.md
+   internals/index
 
 .. _Contributing to Marionette: https://searchfox.org/mozilla-central/source/testing/marionette/CONTRIBUTING.md
 
 
 Bugs
 ====
 
 Bugs are tracked in the `Testing :: Marionette` component.

new file mode 100644
--- /dev/null
+++ b/testing/marionette/doc/internals/index.rst
@@ -0,0 +1,11 @@
+=========
+Internals
+=========
+
+This is an overview of all documented internals in the Marionette server:
+
+.. toctree::
+  :glob:
+  :maxdepth: 1
+
+  *