Update README.md

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@@ -15,7 +15,7 @@ For more information, and a complete account of how to build Shairport Sync for
 
 Acknowledgements
 ---
-Special thanks are due to:
+For the development of AirPlay 2 support, special thanks are due to:
 * [JD Smith](https://github.com/jdtsmith) for really thorough testing, support and encouragement.
 * [ejurgensen](https://github.com/ejurgensen) for advice and [code to deal with pairing and encryption](https://github.com/ejurgensen/pair_ap).
 * [ckdo](https://github.com/ckdo) for pointing the way, with a [functional Python implementation](https://github.com/ckdo/airplay2-receiver) of AirPlay 2.