Note sub-folders with a single domain.
@@ -85,6 +85,14 @@ for our own domains including ``*.readthedocs.io``, ``*.readthedocs-hosted.com``
.. _Strict Transport Security header: https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Strict-Transport-Security
+Multiple documentation sites as sub-folders of a domain
++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+
+You may host multiple documentation repositories as **sub-folders of a single domain**.
+For example, ``docs.foo.org/repo1`` and ``docs.foo.org/repo2``.
+This is `a way to boost the SEO of your website <https://moz.com/blog/subdomains-vs-subfolders-rel-canonical-vs-301-how-to-structure-links-optimally-for-seo-whiteboard-friday>`_.
+
+See :doc:`subprojects` for more information.
Troubleshooting
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