diff --git a/doc/stdenv.xml b/doc/stdenv.xml
index 9de912274dc..1dd8ea8caba 100644
--- a/doc/stdenv.xml
+++ b/doc/stdenv.xml
@@ -987,6 +987,17 @@ passthru.updateScript = [ ../../update.sh pname "--requested-release=unstable" ]
       </para>
      </listitem>
     </varlistentry>
+    <varlistentry>
+     <term>
+      <varname>dontUnpack</varname>
+     </term>
+     <listitem>
+      <para>
+       Set to true to skip the unpack phase.
+      </para>
+     </listitem>
+    </varlistentry>
+    <varlistentry>
     <varlistentry>
      <term>
       <varname>dontMakeSourcesWritable</varname>