From 99da19387705b90647741f020ad2f835e6c8056b Mon Sep 17 00:00:00 2001
From: Adam Joseph <adam@westernsemico.com>
Date: Mon, 12 Sep 2022 12:59:16 -0700
Subject: [PATCH] note that `unionOfDisjoint` is commutative, unlike //

---
 lib/attrsets.nix | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/attrsets.nix b/lib/attrsets.nix
index 6c666ea375e5..31dc27969cc0 100644
--- a/lib/attrsets.nix
+++ b/lib/attrsets.nix
@@ -624,7 +624,8 @@ rec {
 
   /* `unionOfDisjoint x y` is equal to `x // y // z` where the
      attrnames in `z` are the intersection of the attrnames in `x` and
-     `y`, and all values `assert` with an error message */
+     `y`, and all values `assert` with an error message.  This
+      operator is commutative, unlike (//). */
   unionOfDisjoint = x: y:
     x // (mapAttrs
       (name: val: