diff --git a/README.md b/README.md
index ca44395..3c24b0c 100644
--- a/README.md
+++ b/README.md
@@ -14,7 +14,9 @@
 PDFium uses a similar Windows toolchain as Chromium:
 
 #### Open source contributors
-Visual Studio 2015 Update 2 or later is highly recommended.
+Visual Studio 2015 Update 2 or later is highly recommended. Visual Studio 2015
+is current default version, run `set GYP_MSVS_VERSION=2017` when you use Visual
+Studio 2017.
 
 Run `set DEPOT_TOOLS_WIN_TOOLCHAIN=0`, or set that variable in your global
 environment.