diff --git a/README.md b/README.md
index 763d09b..44d05e4 100644
--- a/README.md
+++ b/README.md
@@ -21,10 +21,12 @@ The test suite that exercises GSL has been built and passes successfully on the
 
 * Windows using Visual Studio 2013
 * Windows using Visual Studio 2015
-* Windows using Clang\LLVM 3.6
+* Windows using Clang/LLVM 3.6
 * Windows using GCC 5.1
-* Linux using Clang\LLVM 3.6
-* Linux using GCC 5.1
+* GNU/Linux using Clang/LLVM 3.6
+* GNU/Linux using GCC 5.1
+* Mac OS Yosemite using XCode with AppleClang 7.0.0.7000072
+* Mac OS Yosemite using GCC-5.2.0
 
 > If you successfully port GSL to another platform, we would love to hear from you. Please submit an issue to let us know. Also please consider 
 contributing any changes that were necessary back to this project to benefit the wider community.