diff --git a/man2/epoll_ctl.2 b/man2/epoll_ctl.2
index b4d048e66..725c445e2 100644
--- a/man2/epoll_ctl.2
+++ b/man2/epoll_ctl.2
@@ -205,6 +205,15 @@ is not registered on with this epoll instance.
 There was insufficient memory to handle the requested
 .I op
 control operation.
+.TP ENOSPC
+The limit imposed by
+.I /proc/sys/fs/epoll/max_user_watches
+was encountered while trying to register
+.RB ( EPOLL_CTL_ADD )
+a new file descriptor on an epoll instance.
+See
+.BR epoll (7)
+for further details.
 .TP
 .B EPERM
 The target file