--- pcapy.xml.orig	2009-01-22 22:13:59.000000000 +0000
+++ pcapy.xml	2009-01-22 22:17:05.000000000 +0000
@@ -311,6 +311,14 @@
 	  <classname>Pkthdr</classname> instance describing the data
 	  passed and <parameter>data</parameter> is the data itself.
 	</para>
+	<note>
+	  <para>
+	    If the packet could not be read, a tuple is returned
+	    anyway but with <parameter>header</parameter>
+	    and <parameter>data</parameter> equal respectively
+	    to <constant>None</constant> and an empty string.
+	  </para>
+	</note>
       </refsect1>
     </refentry>