diff --git a/lib/std/os/windows.zig b/lib/std/os/windows.zig
index f2ff2a1c1b7609997cbaf718f0f2e9fdf07bed4a..125b43f736b2b5afabcaa2f0095f9f220969fb49 100644
--- a/lib/std/os/windows.zig
+++ b/lib/std/os/windows.zig
@@ -215,6 +215,10 @@ pub const FILE = struct {
         AccessFlags: ACCESS_MASK,
     };
 
+    // Note: This is not separated into RENAME_INFORMATION and RENAME_INFORMATION_EX because
+    // the only difference is the `Flags` type (BOOLEAN before _EX, ULONG in the _EX),
+    // which doesn't affect the struct layout--the offset of RootDirectory is the same
+    // regardless.
     pub const RENAME_INFORMATION = extern struct {
         Flags: FLAGS,
         RootDirectory: ?HANDLE,