diff --git a/README.md b/README.md
index 700ff59..29b017a 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,10 @@
 # um
 
+> [!IMPORTANT]
+> This repo lives on [my personal forge](https://git.bth.moi/bth/um).
+>
+> Elsewhere it's a read-only mirror. But PRs are accepted here!
+
 An (U)ltralight *zettelkasten* for (M)arkdown composition.
 
 `um` is a *zettelkasten* specification, a CLI for creating compositions, and an emacs toolkit. It uses unique filenames, plaintext tags, the builtin emacs `project` package, and simple commandline conventions. It's grown out of my own scripts and emacs hacks over the years.