diff --git a/lib/libc/sys/kqueue.2 b/lib/libc/sys/kqueue.2
index fb79c11ee79d..ea7b27ed39f9 100644
--- a/lib/libc/sys/kqueue.2
+++ b/lib/libc/sys/kqueue.2
@@ -417,7 +417,7 @@ The
 and
 .Fn kevent
 functions first appeared in
-.Fx 5.0 .
+.Fx 4.1 .
 .Sh AUTHORS
 The
 .Fn kqueue