diff --git a/docs/development/build-instructions-windows.md b/docs/development/build-instructions-windows.md
index 7a7e1ee6c6e9..2c85dbcf11bb 100644
--- a/docs/development/build-instructions-windows.md
+++ b/docs/development/build-instructions-windows.md
@@ -58,13 +58,13 @@ $ python script\build.py -c D
 After building is done, you can find `electron.exe` under `out\D` (debug
 target) or under `out\R` (release target).
 
-## 64bit Build
+## 32bit Build
 
-To build for the 64bit target, you need to pass `--target_arch=x64` when running
-the bootstrap script:
+To build for the 32bit target, you need to pass `--target_arch=ia32` when
+running the bootstrap script:
 
 ```powershell
-$ python script\bootstrap.py -v --target_arch=x64
+$ python script\bootstrap.py -v --target_arch=ia32
 ```
 
 The other building steps are exactly the same.