man/io_uring_enter.2: clarify POLL_ADD return value
@@ -206,7 +206,10 @@ specified in the
field. Unlike poll or epoll without
.BR EPOLLONESHOT ,
this interface always works in one shot mode. That is, once the poll
-operation is completed, it will have to be resubmitted.
+operation is completed, it will have to be resubmitted. This command works like
+an async
+.BR poll(2)
+and the completion event result is the returned mask of events.
.TP
.B IORING_OP_POLL_REMOVE
