Add note about lack of support for private repos
@@ -5,7 +5,9 @@ Importing Your Documentation
:description lang=en: Import your existing technical documentation from version control into Read the Docs.
-To import a documentation repository, visit your `Read the Docs dashboard`_ and click Import_.
+To import a public documentation repository, visit your `Read the Docs dashboard`_ and click Import_. Private
+repositories are not supported.
+
If you have :doc:`connected your Read the Docs account <../connected-accounts>` to GitHub, Bitbucket, or GitLab,
you will see a list of your repositories that we are able to import.
