diff --git a/README.md b/README.md
index 9def5e305db..75ff4f2bf11 100644
--- a/README.md
+++ b/README.md
@@ -87,7 +87,7 @@ fetch snapshots, and an OS that can execute the available snapshot binaries.
 
 Snapshot binaries are currently built and tested on several platforms:
 
-* Windows (7, 8, Server 2008 R2), x86 only
+* Windows (7, 8, Server 2008 R2), x86 and x86-64 (64-bit support added in Rust 0.12.0)
 * Linux (2.6.18 or later, various distributions), x86 and x86-64
 * OSX 10.7 (Lion) or greater, x86 and x86-64