diff --git a/include/media/v4l2-dev.h b/include/media/v4l2-dev.h
index b604a7a50940..70d91c99728b 100644
--- a/include/media/v4l2-dev.h
+++ b/include/media/v4l2-dev.h
@@ -40,7 +40,7 @@ struct v4l2_ctrl_handler;
 /* Use the prio field of v4l2_fh for core priority checking */
 #define V4L2_FL_USE_FH_PRIO	(2)
 /* If ioctl core locking is in use, then apply that also to all
-   file operations. */
+   file operations. Don't use this flag in new drivers! */
 #define V4L2_FL_LOCK_ALL_FOPS	(3)
 
 /* Priority helper functions */