diff --git a/building.md b/building.md
index b71a5ce..71ead53 100644
--- a/building.md
+++ b/building.md
@@ -3,9 +3,12 @@ this document describes to how compile musikcube on all supported platforms
 
 ## windows
 
-- grab the [Visual Studio 2017 Community Edition](https://www.visualstudio.com/en-us/downloads/download-visual-studio-vs.aspx) and install the 32-bit c++ compiler.
+- grab the [Visual Studio 2019 Community Edition](https://www.visualstudio.com/en-us/downloads/download-visual-studio-vs.aspx) and install the c++ compiler; you can select 32-bit, 64-bit, or both.
 - clone the musikcube sources: `git clone https://github.com/clangen/musikcube.git --recursive`
-- install the [32 bit version of boost 1.68](https://sourceforge.net/projects/boost/files/boost-binaries/1.68.0/boost_1_68_0-msvc-14.1-32.exe/download). ensure it shares the same parent directory with musikcube. e.g: `c:\src\musikcube` and `c:\src\boost_1_68_0` -- the project's solution will reference it via relative path.
+- install [boost 1.74]. again, you can use 32-bit, 64-bit, or both.
+    * 32-bit: https://sourceforge.net/projects/boost/files/boost-binaries/1.74.0/boost_1_74_0-msvc-14.2-32.exe/download
+    * 64-bit: https://sourceforge.net/projects/boost/files/boost-binaries/1.74.0/boost_1_74_0-msvc-14.2-64.exe/download
+    * ensure it shares the same parent directory with musikcube. e.g: `c:\src\musikcube` and `c:\src\boost_1_68_0` -- the project's solution will reference it via relative path. if you want to use both 32-bit and 64-bit versions, ensure they are installed to the same directory.
 - open `musikcube.sln` and build/run. 
 
 ## mac