diff --git a/man2/epoll_ctl.2 b/man2/epoll_ctl.2
index 3b3da485b..13b6cd4de 100644
--- a/man2/epoll_ctl.2
+++ b/man2/epoll_ctl.2
@@ -382,7 +382,8 @@ refers to an epoll instance.
 refers to an epoll instance and this
 .B EPOLL_CTL_ADD
 operation would result in a circular loop of epoll instances
-monitoring one another.
+monitoring one another or a nesting depth of epoll instances
+greater than 5.
 .TP
 .B ENOENT
 .I op