diff --git a/sys/sys/poll.h b/sys/sys/poll.h
index 7039ed93b6f1..383cd0dcf0ad 100644
--- a/sys/sys/poll.h
+++ b/sys/sys/poll.h
@@ -62,17 +62,8 @@ struct pollfd {
 #define	POLLRDBAND	0x0080		/* OOB/Urgent readable data */
 #define	POLLWRBAND	0x0100		/* OOB/Urgent data can be written */
 
-/*
- * File extensions:
- * polling on a regular file might return one
- * of these events (currently only supported on UFS).
- */
-#define	POLLEXTEND	0x0200		/* file may have been extended */
-#define	POLLATTRIB	0x0400		/* file attributes may have changed */
-#define	POLLNLINK	0x0800		/* (un)link/rename may have happened */
-#define	POLLWRITE	0x1000		/* file's contents may have changed */
-/* General FreeBSD extensions (currently only supported for sockets): */
-#define	POLLINIGNEOF	0x2000		/* POLLIN, except ignore EOF */
+/* General FreeBSD extension (currently only supported for sockets): */
+#define	POLLINIGNEOF	0x2000		/* like POLLIN, except ignore EOF */
 
 /*
  * These events are set if they occur regardless of whether they were