1 files changed, 1 insertions, 1 deletions

diff --git a/include/drm/drm.h b/include/drm/drm.h
index 32e5096554e9..8e77357334ad 100644
--- a/include/drm/drm.h
+++ b/include/drm/drm.h
@@ -458,7 +458,7 @@ enum drm_vblank_seq_type {
         _DRM_VBLANK_FLIP = 0x8000000,   /**< Scheduled buffer swap should flip */
         _DRM_VBLANK_NEXTONMISS = 0x10000000,    /**< If missed, wait for next vblank */
         _DRM_VBLANK_SECONDARY = 0x20000000,     /**< Secondary display controller */
-        _DRM_VBLANK_SIGNAL = 0x40000000 /**< Send signal instead of blocking */
+        _DRM_VBLANK_SIGNAL = 0x40000000 /**< Send signal instead of blocking, unsupported */
 };
 
 #define _DRM_VBLANK_TYPES_MASK (_DRM_VBLANK_ABSOLUTE | _DRM_VBLANK_RELATIVE)