--- libev/ev.pod	2019/06/23 02:02:30	1.449
+++ libev/ev.pod	2019/06/24 00:04:26	1.450
@@ -600,8 +600,9 @@
 Most problematic in practise, however, is that not all file descriptors
 work with it. For example, in linux 5.1, tcp sockets, pipes, event fds,
 files, F</dev/null> and a few others are supported, but ttys do not work
-(probably because of a bug), so this is not (yet?) a generic event polling
-interface.
+properly (a known bug that the kernel developers don't care about, see
+L<https://lore.kernel.org/patchwork/patch/1047453/>), so this is not
+(yet?) a generic event polling interface.
 
 To work around this latter problem, the current version of libev uses
 epoll as a fallback for file deescriptor types that do not work. Epoll