diff --git a/documentation/ref-manual/introduction.xml b/documentation/ref-manual/introduction.xml
index 7f6729db55..2e1b8e1740 100644
--- a/documentation/ref-manual/introduction.xml
+++ b/documentation/ref-manual/introduction.xml
@@ -223,7 +223,7 @@
                 "<link linkend='ref-images'>Images</link>"
                 chapter.
                 </para></listitem>
-            <listitem><para id='layer'>
+            <listitem><para>
                 <emphasis>Layer:</emphasis>
                 A collection of recipes representing the core,
                 a BSP, or an application stack.