diff --git a/src/devices/video/mc6845.h b/src/devices/video/mc6845.h
index 43338ca1777..75064491b28 100644
--- a/src/devices/video/mc6845.h
+++ b/src/devices/video/mc6845.h
@@ -62,7 +62,9 @@ public:
 	// construction/destruction
 	mc6845_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
 
+	// HACK: show the full screen_device htotal/vtotal if true (regulate with UI slider controls)
 	void set_show_border_area(bool show) { m_show_border_area = show; }
+	// HACK: a static alternative of above
 	void set_visarea_adjust(int min_x, int max_x, int min_y, int max_y)
 	{
 		m_visarea_adjust_min_x = min_x;