diff --git a/en_US.ISO8859-1/books/faq/book.sgml b/en_US.ISO8859-1/books/faq/book.sgml
index 55de42ee9a..56d648f0df 100644
--- a/en_US.ISO8859-1/books/faq/book.sgml
+++ b/en_US.ISO8859-1/books/faq/book.sgml
@@ -2867,6 +2867,44 @@ device card 1</programlisting>
     <title>Troubleshooting</title>
 
     <qandaset>
+      <qandaentry>
+        <question id="pae">
+          <para>Why is &os; finding the wrong amount of memory?</para>
+        </question>
+
+        <answer>
+	  <para>The reason is the difference between physical memory addresses
+	    and virtual addresses.</para>
+
+	  <para>The convention for most PC hardware is to use the memory area
+	    between 3.5G and 4G for a special purpose (usually for PCI).  This
+	    address space is used to access PCI hardware.  As a result real,
+	    physical memory can not appear in that address space.</para>
+
+	  <para>What happens to the memory that should appear in that location
+	    is dependent on your hardware.  Unfortunately, some hardware does
+	    nothing and the ability to use that last 500M of RAM is entirely
+	    lost.</para>
+
+	  <para>Luckily, most hardware remaps the memory to a higher location
+	    so that it can still be used.  However, this can cause some
+	    confusion if you watch the boot messages.</para>
+
+	  <para>On a 32 bit version of &os;, the memory appears lost, since it
+	    will be remapped above 4G, which a 32 bit kernel is unable to
+	    access.  In this case, the solution is to build a PAE enabled
+	    kernel.  See <link linkend="memory-limits">this FAQ entry</link>
+	    for more information.</para>
+
+	  <para>On a 64 bit version of &os;, or when running a PAE-enabled
+	    kernel, &os; will correctly detect and remap the memory so it is
+	    usable.  During boot, however, it may seem as if &os; is detecting
+	    more memory than the system really has.  This is normal and the
+	    available memory will be corrected as the boot process
+	    completes.<para>
+        </answer>
+      </qandaentry>
+
       <qandaentry>
         <question id="awre">
           <para>What do I do when I have bad blocks on my hard drive?</para>