--- a/src/common/trailer.h	Fri Sep 18 18:21:15 2009 +0200
+++ b/src/common/trailer.h	Fri Sep 18 22:18:06 2009 +0200
@@ -79,6 +79,7 @@
    */
   virtual uint32_t Deserialize (Buffer::Iterator end) = 0;
   /**
+   * \param os output stream
    * This method is used by Packet::Print to print the 
    * content of a trailer as ascii data to a c++ output stream.
    * Although the trailer is free to format its output as it