diff --git a/include/drm/drm.h b/include/drm/drm.h
index 5e6cd291..42133bce 100644
--- a/include/drm/drm.h
+++ b/include/drm/drm.h
@@ -776,6 +776,8 @@ struct drm_event_vblank {
 
 #define DRM_CAP_DUMB_BUFFER 0x1
 #define DRM_CAP_VBLANK_HIGH_CRTC   0x2
+#define DRM_CAP_DUMB_PREFERRED_DEPTH 0x3
+#define DRM_CAP_DUMB_PREFER_SHADOW 0x4
 
 /* typedef area */
 typedef struct drm_clip_rect drm_clip_rect_t;