diff --git a/include/drm/drm_modes.h b/include/drm/drm_modes.h
index 9f3421c8efcd870a410eb3a2ba1d97d66e8035ad..bce573375dd834dcc9f135c5dd3cd737b84486f1 100644
--- a/include/drm/drm_modes.h
+++ b/include/drm/drm_modes.h
@@ -300,7 +300,7 @@ struct drm_display_mode {
 	 *  - DRM_MODE_FLAG_NCSYNC: composite sync is active low.
 	 *  - DRM_MODE_FLAG_HSKEW: hskew provided (not used?).
 	 *  - DRM_MODE_FLAG_BCAST: not used?
-	 *  - DRM_MODE_FLAG_PIXMUX: not used?
+	 *  - DRM_MODE_FLAG_PIXMUX: <deprecated>
 	 *  - DRM_MODE_FLAG_DBLCLK: double-clocked mode.
 	 *  - DRM_MODE_FLAG_CLKDIV2: half-clocked mode.
 	 *
diff --git a/include/uapi/drm/drm_mode.h b/include/uapi/drm/drm_mode.h
index 004db470b4779b56f76248fb1ff8ab73c4f57a5f..8d872e17223e7cb4de2807ff87112950fd1334b2 100644
--- a/include/uapi/drm/drm_mode.h
+++ b/include/uapi/drm/drm_mode.h
@@ -75,7 +75,7 @@ extern "C" {
 #define DRM_MODE_FLAG_NCSYNC			(1<<8)
 #define DRM_MODE_FLAG_HSKEW			(1<<9) /* hskew provided */
 #define DRM_MODE_FLAG_BCAST			(1<<10)
-#define DRM_MODE_FLAG_PIXMUX			(1<<11)
+#define DRM_MODE_FLAG_PIXMUX			(1<<11) /* deprecated */
 #define DRM_MODE_FLAG_DBLCLK			(1<<12)
 #define DRM_MODE_FLAG_CLKDIV2			(1<<13)
  /*
@@ -118,7 +118,6 @@ extern "C" {
 				 DRM_MODE_FLAG_NCSYNC |		\
 				 DRM_MODE_FLAG_HSKEW |		\
 				 DRM_MODE_FLAG_BCAST |		\
-				 DRM_MODE_FLAG_PIXMUX |		\
 				 DRM_MODE_FLAG_DBLCLK |		\
 				 DRM_MODE_FLAG_CLKDIV2 |	\
 				 DRM_MODE_FLAG_3D_MASK)