Index: src/site/pdf.xml
===================================================================
--- src/site/pdf.xml	(revision 1465597)
+++ src/site/pdf.xml	(working copy)
@@ -37,6 +37,7 @@
     <item name="Appenders" ref="/manual/appenders.html"/>
     <item name="Layouts" ref="/manual/layouts.html"/>
     <item name="Filters" ref="/manual/filters.html"/>
+    <item name="Async" ref="/manual/async.html" />
     <item name="JMX" ref="/manual/jmx.html"/>
     <item name="Logging Separation" ref="/manual/logsep.html"/>
     <item name="Extending Log4j" ref="/manual/extending.html"/>