diff --git a/doc/stdenv/stdenv.xml b/doc/stdenv/stdenv.xml
index 706a010715d092..fc586b06fde29d 100644
--- a/doc/stdenv/stdenv.xml
+++ b/doc/stdenv/stdenv.xml
@@ -475,7 +475,7 @@ passthru.updateScript = writeScript "update-zoom-us" ''
 <programlisting>
 passthru.updateScript = [ ../../update.sh pname "--requested-release=unstable" ];
 </programlisting>
-      The script will be run with <variable>UPDATE_NIX_ATTR_PATH</variable> environment variable set to the attribute path it is supposed to update.
+      The script will be run with <varname>UPDATE_NIX_ATTR_PATH</varname> environment variable set to the attribute path it is supposed to update.
       <note>
        <para>
         The script will be usually run from the root of the Nixpkgs repository but you should not rely on that. Also note that the update scripts will be run in parallel by default; you should avoid running <command>git commit</command> or any other commands that cannot handle that.