diff --git a/doc/index.md b/doc/index.md
index 70d3dfa68..51bed2e27 100644
--- a/doc/index.md
+++ b/doc/index.md
@@ -7,3 +7,9 @@ restic is a backup program that is fast, efficient and secure. On the left you
 can find an overview of the documentation. The project's homepage is
 <https://restic.github.io>, the source code repository can be found on GitHub
 at the URL <https://github.com/restic/restic>.
+
+The documentation you're currently viewing may not match the version of restic
+you have installed. If you cloned the repository manually, you can find the
+right documentation in the directory `doc/`. If you're viewing this online at
+<https://restic.readthedocs.org>, there is a small menu at the bottom left of
+this page, where you can select the version.