From d5cb17c67903c50aa1bb370e9470c8c630531f14 Mon Sep 17 00:00:00 2001
From: Changming Sun <chasun@microsoft.com>
Date: Thu, 31 Dec 2020 15:42:11 -0800
Subject: [PATCH] Update BUILD.md

---
 BUILD.md | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/BUILD.md b/BUILD.md
index 87275f384c..6902ee05c6 100644
--- a/BUILD.md
+++ b/BUILD.md
@@ -728,14 +728,17 @@ ORT_DEBUG_NODE_IO_DUMP_DATA_TO_FILES=1
 ---
 
 ## Architectures
-### x86
+### [64-bit x86](https://en.wikipedia.org/wiki/X86-64) (also known as x86_64 or AMD64)
+
+This is the default.
+
+### 32-bit x86
 #### Build Instructions
 ##### Windows
 * add `--x86` argument when launching `.\build.bat`
 
 ##### Linux
-* Must be built on a x86 OS
-* add --x86 argument to build.sh
+(Not officially supported)
 
 ---
 
@@ -1230,4 +1233,4 @@ These dependency versions should reflect what is in [Dockerfile.training](./dock
    * Change to the ONNX Runtime repo base folder: `cd onnxruntime`
    * Run `./build.sh --config RelWithDebInfo --enable_training --build_wheel --use_rocm --rocm_home /opt/rocm --nccl_home /opt/rocm --mpi_home <location for openmpi>`
 
-    This produces the .whl file in `./build/Linux/RelWithDebInfo/dist` for ONNX Runtime Training.
\ No newline at end of file
+    This produces the .whl file in `./build/Linux/RelWithDebInfo/dist` for ONNX Runtime Training.