diff --git a/flake.nix b/flake.nix
index f6e81cf5..c856d89a 100644
--- a/flake.nix
+++ b/flake.nix
@@ -3,6 +3,8 @@
 
   inputs =
     {
+      # Once desired, bump master's locked revision:
+      # nix flake update --update-input master
       master.url = "nixpkgs/master";
       nixos.url = "nixpkgs/release-20.09";
       home.url = "github:nix-community/home-manager/release-20.09";