diff --git a/README b/README
index 8689e9c21..2c272fb58 100644
--- a/README
+++ b/README
@@ -4,15 +4,22 @@ all platform differences in this library.
 
 http://nodejs.org/
 
-== Design
+## Supported Platforms
+
+Microsoft Windows operating systems since Windows 2000. Build either Visual
+Studio or MingW.
+
+Linux 2.6 and MacOS using the GCC toolchain.
+
+## Design
 
 The goal of this library is to provide high-concurrency high-performance I/O
 on all operating systems. This is a large undertaking. Some of the API
 decisions may seem arbitrary but are actually borne out of various specific
 platform issues.
 
-=== oio_read_start(), oio_read_stop()
+## oio_read_start(), oio_read_stop()
 
 Originally we wanted to provide a asynchronous read function that was
-similar to 
+similar to WSARecv().