diff --git a/src/arch/LoadingWindow/LoadingWindow_Win32.cpp b/src/arch/LoadingWindow/LoadingWindow_Win32.cpp
index 6826115d5f..da9c10bb08 100644
--- a/src/arch/LoadingWindow/LoadingWindow_Win32.cpp
+++ b/src/arch/LoadingWindow/LoadingWindow_Win32.cpp
@@ -118,6 +118,7 @@ void LoadingWindow_Win32::SetIcon( const RageSurface *pIcon )
 
 	m_hIcon = IconFromSurface( pIcon );
 	if( m_hIcon != NULL )
+		// XXX: GCL_HICON isn't available on x86-64 Windows
 		SetClassLong( hwnd, GCL_HICON, (LONG) m_hIcon );
 }