From d59e4fbb75e307fd1a0e98c44627f38bab504aeb Mon Sep 17 00:00:00 2001
From: John Ericson <Ericson2314@Yahoo.com>
Date: Sun, 23 Apr 2017 14:01:03 -0400
Subject: [PATCH] stage.nix: Better explain why `buildPackages` as `null` is
 valid arg

---
 pkgs/top-level/stage.nix | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/pkgs/top-level/stage.nix b/pkgs/top-level/stage.nix
index 6febedb79f3..ead6ec18fb3 100644
--- a/pkgs/top-level/stage.nix
+++ b/pkgs/top-level/stage.nix
@@ -46,7 +46,8 @@
   ##
 
 , # The package set used at build-time. If null, `buildPackages` will
-  # be defined internally as the produced package set as itself.
+  # be defined internally as the final produced package set itself. This allows
+  # us to avoid expensive splicing.
   buildPackages
 
 , # The standard environment to use for building packages.