diff --git a/flake.nix b/flake.nix
index a6e612d..c856d89 100644
--- a/flake.nix
+++ b/flake.nix
@@ -3,6 +3,7 @@
 
   inputs =
     {
+      # Once desired, bump master's locked revision:
       # nix flake update --update-input master
       master.url = "nixpkgs/master";
       nixos.url = "nixpkgs/release-20.09";