diff --git a/hw/xbox/nv2a.c b/hw/xbox/nv2a.c
index 3e606c8d7d..e69c415f69 100644
--- a/hw/xbox/nv2a.c
+++ b/hw/xbox/nv2a.c
@@ -3379,6 +3379,7 @@ static bool pgraph_zeta_write_enabled(PGRAPHState *pg)
 
 static void pgraph_set_surface_dirty(PGRAPHState *pg, bool color, bool zeta)
 {
+    /* FIXME: Does this apply to CLEARs too? */
     color = color && pgraph_color_write_enabled(pg);
     zeta = zeta && pgraph_zeta_write_enabled(pg);
     pg->surface_color.draw_dirty |= color;
@@ -3397,6 +3398,7 @@ static void pgraph_update_surface(NV2AState *d,
     pgraph_get_surface_dimensions(pg, &width, &height);
     pgraph_apply_anti_aliasing_factor(pg, &width, &height);
 
+    /* FIXME: Does this apply to CLEARs too? */
     color = color && pgraph_color_write_enabled(pg);
     zeta = zeta && pgraph_zeta_write_enabled(pg);