diff --git a/pkgs/development/python-modules/kaldi-active-grammar/default.nix b/pkgs/development/python-modules/kaldi-active-grammar/default.nix
index 87fb818e7e37..a1ef7e314656 100644
--- a/pkgs/development/python-modules/kaldi-active-grammar/default.nix
+++ b/pkgs/development/python-modules/kaldi-active-grammar/default.nix
@@ -13,6 +13,11 @@
 , callPackage
 }:
 
+#
+# Maintainer note: only in-tree dependant is `dragonfly`, try to
+# update the two alongside eachother.
+#
+
 let
   kaldi = callPackage ./fork.nix { };
 in