diff --git a/pkgs/top-level/splice.nix b/pkgs/top-level/splice.nix
index c08aceaa2abf..718ed9f40f9d 100644
--- a/pkgs/top-level/splice.nix
+++ b/pkgs/top-level/splice.nix
@@ -32,8 +32,6 @@ let
         # The same pkgs sets one probably intends
         // inputs.buildHost
         // inputs.hostTarget;
-      # perf: mapAttrs defers merge calls until a key is selected, avoiding
-      # ~60k eager closures that listToAttrs+map would create.
       merge =
         name: defaultValue:
         let