- <para>The value of the parameter is copied into the memory area
- containing the message and may be changed after this call. If
- <parameter>type</parameter> is <literal>h</literal> (UNIX file
- descriptor), it is always "consumed" by this call, and either
- successfully appended to the message or closed.</para>
+ <para>The value of the parameter is copied into a memory area held
+ by the message object, stays in the possession of the caller and
+ may hence be freely changed after this call without affecting the
+ bus message it has been added to. If <parameter>type</parameter>
+ is <literal>h</literal> (UNIX file descriptor), the descriptor is
+ duplicated by this call and the passed descriptor stays in
+ possession of the caller.</para>