diff --git a/ACKNOWLEDGMENTS.txt b/ACKNOWLEDGMENTS.txt
index 5154a95..53bc9a4 100644
--- a/ACKNOWLEDGMENTS.txt
+++ b/ACKNOWLEDGMENTS.txt
@@ -17,6 +17,12 @@ Copyright (C) 1999-2001, 2016 Free Software Foundation, Inc.
 Distributed under the LGPLv2 license (See MacRomanConversion/LICENSE.txt)
 
 
+RapidJSON:
+Copyright (C) 2015 THL A29 Limited, a Tencent company, and Milo Yip.  All rights reserved.
+
+Distributed under the MIT license (See rapidjson/license.txt)
+
+
 zlib:
 (C) 1995-2017 Jean-loup Gailly and Mark Adler
 Distributed under zlib license (See zlib/README)
\ No newline at end of file