Moved note to new place of inversion.

src/win32_window.c

@@ -728,6 +728,7 @@ static LRESULT CALLBACK windowProc(HWND hWnd, UINT uMsg,
         case WM_MOUSEHWHEEL:
         {
             // This message is only sent on Windows Vista and later
+            // NOTE: The X-axis is inverted for consistency with OS X and X11.
             _glfwInputScroll(window, -((SHORT) HIWORD(wParam) / (double) WHEEL_DELTA), 0.0);
             return 0;
         }