License question: GPL copyright header

I am starting a new GPL v2 project that will build upon existing GPLed code. At present, the header inside the other project's files looks like this:

/**
*
* Copyright (c) 2006-2009 Andrew Person
* Distributed under the GNU GPL v2. For full terms see the file docs/COPYING.
*
*/

Now, when I have made modifications, I obviously need to leave the original copyright in-tact, as per the license, but need to add my name and attribution. How should I go about that? Would this be acceptable?

/**
*
* Copyright (c) 2006-2009 Andrew Person
* Copyright (c) 2011 Martin Eve
* Distributed under the GNU GPL v2. For full terms see the file docs/COPYING.
*
*/

---

A few GPL licenced projects I have seen use something like:

/*
* Copyright (C) 200?-200? Project
* based on code by ForkedProjectCopyrightHolder copyright (C) 200?-200? ForkedProject
* License: http://www.gnu.org/licenses/gpl.html GPL version 2 or higher
*/

I am not a lawyer so I may be wrong but section 2.a of the GPLv2 indicates that you must make clear that the code distributed is a modified version of a previous work. Not sure if your version of the copyright header makes that clear or if it can simply be interpreted as a change of the copyright holder (if that is possible at all).

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