diff --git a/nixos/doc/manual/development.xml b/nixos/doc/manual/development.xml
index cbf7ff8902f..be1cbc97d5e 100644
--- a/nixos/doc/manual/development.xml
+++ b/nixos/doc/manual/development.xml
@@ -494,7 +494,7 @@ module writers.</para>
 <variablelist>
 
   <varlistentry>
-    <term><option>etc.environment</option></term>
+    <term><option>environment.etc</option></term>
     <listitem>
       <para>This set defines files in <filename>/etc</filename>.  A
       typical use is: