diff --git a/3rdparty/README.md b/3rdparty/README.md
index 70cdf28de92..563285d6cec 100644
--- a/3rdparty/README.md
+++ b/3rdparty/README.md
@@ -6,6 +6,10 @@ bgfx - [The BSD 2-Clause License](http://opensource.org/licenses/BSD-2-Clause)
 
 bx - [The BSD 2-Clause License](http://opensource.org/licenses/BSD-2-Clause)
 
+compat - Wine headers missing in MinGW [The GNU Lesser General Public License, version 2.1 (LGPL-2.1)](http://opensource.org/licenses/LGPL-2.1)
+
+**note that this one contain headers only and that real library/dll is dinamicaly loaded so use in commercial project is allowed**
+
 dxsdk - [DirectX SDK EULA](https://github.com/mamedev/mame/blob/master/3rdparty/dxsdk/Documentation/License%20Agreements/DirectX%20SDK%20EULA.txt)
 
 expat - [The MIT License (MIT)](http://opensource.org/licenses/MIT)