diff --git a/README.md b/README.md
index e029e502..747abdff 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,17 @@
 # Setup
 
+## Add this repo to your local Nix registry
+
+As an alternative to a local checkout, always pull the latest code
+from this repo.
+
+```bash
+nix registry add c3d2 git+https://gitea.c3d2.de/C3D2/nix-config
+```
+
+This enables `nix` commands to find this Flake given the `c3d2#`
+prefix in some arguments.
+
 ## Working with this repo
 
 If you checked out this git repository for working on the code,