From dba9173a1d8cb1dd40e5922d009cb3a434e081c3 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Na=C3=AFm=20Favier?= <n@monade.li>
Date: Fri, 27 Jan 2023 15:25:07 +0100
Subject: [PATCH] Document default `nix-path` value

---
 src/libexpr/eval.hh | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/libexpr/eval.hh b/src/libexpr/eval.hh
index 876a6ae0e33..2340ef67bd9 100644
--- a/src/libexpr/eval.hh
+++ b/src/libexpr/eval.hh
@@ -581,7 +581,14 @@ struct EvalSettings : Config
 
     Setting<Strings> nixPath{
         this, {}, "nix-path",
-        "List of directories to be searched for `<...>` file references."};
+        R"(
+          List of directories to be searched for `<...>` file references.
+
+          If [pure evaluation](#conf-pure-eval) is disabled,
+          this is initialised using the [`NIX_PATH`](@docroot@/command-ref/env-common.md#env-NIX_PATH)
+          environment variable, or, if it is unset and [restricted evaluation](#conf-restrict-eval)
+          is disabled, a default search path including the user's and `root`'s channels.
+        )"};
 
     Setting<bool> restrictEval{
         this, false, "restrict-eval",