diff --git a/README.md b/README.md
index 05739d1..aefa6be 100644
--- a/README.md
+++ b/README.md
@@ -23,6 +23,7 @@ If you are looking for old, C++03 version, please use `devel-picojson` branch.
   * [x] Linux + gcc/clang
   * [x] Windows + MinGW
   * [x] Windows + Visual Studio 2015 or later.
+    * Visual Studio 2013 is not supported since they have limited C++11 support and failed to compile `json.hpp`.
   * [x] Android + CrystaX(NDK drop-in replacement) GCC
   * [x] Web using Emscripten(LLVM)
 * Moderate parsing time and memory consumption.