From c0559a1d6092b94c7ce46a065d72fc74e4db51dd Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Vladim=C3=ADr=20=C4=8Cun=C3=A1t?= <v@cunat.cz>
Date: Fri, 17 May 2019 09:50:42 +0200
Subject: [PATCH] docs: describe $IN_NIX_SHELL values (#2796)

See commit 1bffd83e1a9
---
 doc/manual/command-ref/env-common.xml | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/doc/manual/command-ref/env-common.xml b/doc/manual/command-ref/env-common.xml
index c532ffdd..6a3aaae7 100644
--- a/doc/manual/command-ref/env-common.xml
+++ b/doc/manual/command-ref/env-common.xml
@@ -14,7 +14,8 @@
 <varlistentry><term><envar>IN_NIX_SHELL</envar></term>
 
   <listitem><para>Indicator that tells if the current environment was set up by
-  <command>nix-shell</command>.</para></listitem>
+  <command>nix-shell</command>.  Since Nix 2.0 the values are
+  <literal>"pure"</literal> and <literal>"impure"</literal></para></listitem>
 
 </varlistentry>