diff --git a/doc/stdenv.xml b/doc/stdenv.xml
index 63e6450860a..e8171a78dcc 100644
--- a/doc/stdenv.xml
+++ b/doc/stdenv.xml
@@ -747,7 +747,8 @@ passthru.updateScript = [ ../../update.sh pname "--requested-release=unstable" ]
    latter is convenient from a build script. However, typically one only wants
    to <emphasis>add</emphasis> some commands to a phase, e.g. by defining
    <literal>postInstall</literal> or <literal>preFixup</literal>, as skipping
-   some of the default actions may have unexpected consequences.
+   some of the default actions may have unexpected consequences. The default
+   script for each phase is defined in the file <filename>pkgs/stdenv/generic/setup.sh</filename>.
   </para>
 
   <section xml:id="ssec-controlling-phases">