diff --git a/en_US.ISO8859-1/articles/vm-design/article.sgml b/en_US.ISO8859-1/articles/vm-design/article.sgml
index b022a1203d..60d7fd3034 100644
--- a/en_US.ISO8859-1/articles/vm-design/article.sgml
+++ b/en_US.ISO8859-1/articles/vm-design/article.sgml
@@ -57,7 +57,7 @@
     </legalnotice>
   </articleinfo>
 
-  <sect1>
+  <sect1 id="introduction">
     <title>Introduction</title>
 
     <para>Before moving along to the actual design let's spend a little time
@@ -114,7 +114,7 @@
       to algorithmic design and code generalization.</para>
   </sect1>
 
-  <sect1>
+  <sect1 id="vm-objects">
     <title>VM Objects</title>
 
     <para>The best way to begin describing the FreeBSD VM system is to look at
@@ -307,7 +307,7 @@
       that they can be ignored, leaving no real disadvantage.</para>
   </sect1>
 
-  <sect1>
+  <sect1 id="swap-layers">
     <title>SWAP Layers</title>
 
     <para>Private data pages are initially either copy-on-write or zero-fill
@@ -357,7 +357,7 @@
       I ensured that such an addition could be made.</para>
   </sect1>
 
-  <sect1>
+  <sect1 id="freeing-pages">
     <title>When to free a page</title>
 
     <para>Since the VM system uses all available memory for disk caching,
@@ -440,7 +440,7 @@
       pages.  I do not know whether this is still true today.</para>
   </sect1>
 
-  <sect1>
+  <sect1 id="prefault-optimizations">
     <title>Pre-Faulting and Zeroing Optimizations</title>
 
     <para>Taking a VM fault is not expensive if the underlying page is already
@@ -476,7 +476,7 @@
       optimize the critical path.</para>
   </sect1>
 
-  <sect1>
+  <sect1 id="page-table-optimizations">
     <title>Page Table Optimizations</title>
 
     <para>The page table optimizations make up the most contentious part of
@@ -511,7 +511,7 @@
       whether a page can be reused or not.</para>
   </sect1>
 
-  <sect1>
+  <sect1 id="page-coloring-optimizations">
     <title>Page Coloring</title>
 
     <para>We will end with the page coloring optimizations.  Page coloring is a
@@ -546,7 +546,7 @@
       performance.</para>
   </sect1>
 
-  <sect1>
+  <sect1 id="conclusion">
     <title>Conclusion</title>
 
     <para>Virtual memory in modern operating systems must address a number of
@@ -558,7 +558,7 @@
       years, and work is ongoing.</para>
   </sect1>
 
-  <sect1>
+  <sect1 id="allen-briggs-qa">
     <title>Bonus QA session by Allen Briggs
       <email>briggs@ninthwonder.com</email></title>