diff --git a/doc/manual/rl-next/relative-path-flakes.md b/doc/manual/rl-next/relative-path-flakes.md
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+---
+synopsis: "Support for relative path inputs"
+prs: [10089]
+---
+
+Flakes can now refer to other flakes in the same repository using relative paths, e.g.
+```nix
+inputs.foo.url = "path:./foo";
+```
+uses the flake in the `foo` subdirectory of the referring flake.
+
+This feature required a change to the lock file format. Previous Nix versions will not be able to use lock files that have locks for relative path inputs in them.