diff --git a/README.md b/README.md
index 243b7cd..1c84490 100644
--- a/README.md
+++ b/README.md
@@ -33,6 +33,7 @@ The test suite that exercises GSL has been built and passes successfully on the
 * OS X Yosemite using Xcode with Apple Clang 7.0.0.7000072
 * OS X Yosemite using GCC-5.2.0
 * OS X Sierra 10.12.4 using Apple LLVM version 8.1.0 (Clang-802.0.42)
+* OS X El Capitan (10.11) using Xcode with AppleClang 8.0.0.8000042
 * FreeBSD 10.x with Clang/LLVM 3.6
 
 > 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