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-rw-r--r--doc/manual/command-ref/env-common.xml3
1 files changed, 2 insertions, 1 deletions
diff --git a/doc/manual/command-ref/env-common.xml b/doc/manual/command-ref/env-common.xml
index c532ffddea22..6a3aaae717e2 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>