diff --git a/headers/private/graphics/nvidia/DriverInterface.h b/headers/private/graphics/nvidia/DriverInterface.h
index e013091bae..e61aaad187 100644
--- a/headers/private/graphics/nvidia/DriverInterface.h
+++ b/headers/private/graphics/nvidia/DriverInterface.h
@@ -89,12 +89,16 @@ enum {
 #define NV10_CONTEXT_SURFACES_2D		0x00000010 /* 2D */
 #define NV1_IMAGE_FROM_CPU				0x00000010 /* 2D: unused, remove? */
 #define NV_IMAGE_BLIT					0x00000011 /* 2D */
-//fixme: lose NV3_GDI_RECTANGLE_TEXT later on? DMA does not work with it..
-//non-dma:
+/* fixme:
+ * never use NV3_GDI_RECTANGLE_TEXT for DMA acceleration:
+ * There's a hardware fault in the input->output colorspace conversion here.
+ * Besides, in NV40 and up this command nolonger exists. Both 'facts' are confirmed
+ * by testing.
+ * Note:
+ * There's no (big) speed difference between NV3_GDI_RECTANGLE_TEXT and
+ * NV4_GDI_RECTANGLE_TEXT (tested with BeRoMeter 1.2.6). */
 #define NV3_GDI_RECTANGLE_TEXT			0x00000012 /* 2D */
-//dma:
 #define NV4_GDI_RECTANGLE_TEXT			0x00000012 /* 2D */
-//end fixme.
 #define NV_RENDER_D3D0_TRIANGLE_ZETA	0x00000013 /* unused (yet?) */
 #define NV4_DX5_TEXTURE_TRIANGLE		0x00000014 /* 3D */
 #define NV10_DX5_TEXTURE_TRIANGLE		0x00000014 /* 3D */
diff --git a/headers/private/graphics/nvidia/nv_acc.h b/headers/private/graphics/nvidia/nv_acc.h
index 488b0f0de4..430042b3da 100644
--- a/headers/private/graphics/nvidia/nv_acc.h
+++ b/headers/private/graphics/nvidia/nv_acc.h
@@ -306,6 +306,7 @@ typedef struct {
 #define NV_IMAGE_PATTERN_SETCOLOR0				0x0310
 #define NV_IMAGE_BLIT_SOURCEORG					0x0300
 //fixme note: non-DMA acc is still using NV3_GDI_RECTANGLE_TEXT...
+//which is just as fast as NV4_GDI_RECTANGLE_TEXT, but has a hardware fault for DMA!
 #define NV4_GDI_RECTANGLE_TEXT_SETCOLORFORMAT	0x0300
 #define NV4_GDI_RECTANGLE_TEXT_COLOR1A			0x03fc
 #define NV4_GDI_RECTANGLE_TEXT_UCR0_LEFTTOP		0x0400