diff --git a/README.rst b/README.rst
index 63d1e68..49654da 100644
--- a/README.rst
+++ b/README.rst
@@ -11,6 +11,13 @@ hererocks
 
 ``hererocks`` is a single file Python script for installing `Lua <http://http://www.lua.org/>`_ (or `LuaJIT <http://luajit.org/>`_) and `LuaRocks <https://luarocks.org/>`_, its package manager, into a local directory. It configures Lua to only see packages installed by that bundled version of LuaRocks, so that the installation is isolated.
 
+Supported platforms
+-------------------
+
+hererocks supports platforms that have `gcc` (`cc` for OS X). When building Lua it emulates a ``make`` target, using ``linux``, ``macosx`, and ``freebsd`` on corresponding systems and falling back to ``posix`` and ``generic`` on others.
+
+Windows support is almost implemented on master branch, but latest released version doesn't have it yet.
+
 Installation
 ------------