diff --git a/README.md b/README.md
index 92b3917609b79315023f69774180784b3bfa4754..b2cfb4c9d147ab01735efcff8996f5adf8a01887 100644
--- a/README.md
+++ b/README.md
@@ -267,6 +267,14 @@ since it will usually contain spaces, making the build fail.
 8. Look in the top level source directory and double-click the setup file to
    start installing Purr Data on your system.
 
+#### Windows 64-bit Using msys2
+
+The instructions are exactly the same as for the 32 bit build (see above), but the build needs to be done using mingw64 instead of mingw32. That is:
+
+- Install the mingw64 packages for the dependencies. See the i686 packages listed under dependencies above, and replace i686 with x86_64 in the package names when installing.
+
+- Use the MSYS2 MinGW 64-bit shell (rather than the 32-bit shell) to do the build.
+
 ### Code of Conduct
 
 1. No sarcasm, please