diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -1,5 +1,7 @@
 This flake exports the list of builtin libraries of each Emacs version.
 
+This is used in [Rice](https://github.com/emacs-twist/elisp-rice) to expose
+Emacs Lisp packages to the flake while avoiding IFD.
 ## Usage
 
 ``` nix