diff --git a/en_US.ISO8859-1/articles/portbuild/article.sgml b/en_US.ISO8859-1/articles/portbuild/article.sgml
index acbce8763e..595eba250a 100644
--- a/en_US.ISO8859-1/articles/portbuild/article.sgml
+++ b/en_US.ISO8859-1/articles/portbuild/article.sgml
@@ -491,7 +491,8 @@
 
 	<listitem>
 	  <para><literal>build portsupdate <replaceable>arch</replaceable>
-	    <replaceable>branch</replaceable></literal> - Replaces the ports
+	    <replaceable>branch</replaceable>
+	    <replaceable>buildid</replaceable></literal> - Replaces the ports
 	    tree with a new ZFS snapshot.  Don't forget to use
 	    <literal>-noports</literal> flag to <command>dopackages</command>
 	    later!