diff --git a/README.md b/README.md
index 5a3d052..e6fc248 100644
--- a/README.md
+++ b/README.md
@@ -63,8 +63,14 @@ and examine or modify game variables. There are two ways to use the debugger:
 ## Installation
 
 Prebuilt packages for Windows and Android can be downloaded from the
-[Releases](https://github.com/kichikuou/xsystem35-sdl2/releases) page. For
-other platforms, refer to the [Building](#building) section.
+[Releases](https://github.com/kichikuou/xsystem35-sdl2/releases) page.
+
+Note for Windows:
+- The 64-bit version supports Windows 10 or later. For older versions of
+  Windows, please use the 32-bit version.
+- Debugging is supported only in the 64-bit version.
+
+For other platforms, refer to the [Building](#building) section.
 
 ## Running
 ### Windows