diff --git a/headers/private/graphics/nvidia/nv_macros.h b/headers/private/graphics/nvidia/nv_macros.h
index 0a23cf876e..5c69a751f3 100644
--- a/headers/private/graphics/nvidia/nv_macros.h
+++ b/headers/private/graphics/nvidia/nv_macros.h
@@ -132,6 +132,7 @@
 #define NVACC_NV10_CTX_CTRL	0x00400144
 #define NVACC_NV4X_DMA_SRC	0x00400220
 #define NVACC_NV4X_WHAT1	0x0040032c
+#define NVACC_NV4X_WHAT2	0x00405000
 #define NVACC_NV25_WHAT0	0x00400610
 #define NVACC_STATUS		0x00400700
 #define NVACC_NV04_SURF_TYP	0x0040070c
@@ -833,6 +834,7 @@
 /* Nvidia MPEG2 hardware decoder (GeForce4MX only) */
 #define NVBES_DEC_GENCTRL	0x00001588
 /* unknown registers */
+#define NV32_NV4X_WHAT0		0x00001540
 #define NV32_NV44_WHAT10	0x00001700
 #define NV32_NV44_WHAT11	0x00001704
 #define NV32_NV44_WHAT12	0x00001708