diff --git a/docs/sleep.1 b/docs/sleep.1
index 09cace0..5b7108b 100644
--- a/docs/sleep.1
+++ b/docs/sleep.1
@@ -1,3 +1,8 @@
+.\" Copyright (c) 2024 DTB <trinity@trinity.moe>
+.\"
+.\" This work is licensed under CC BY-SA 4.0. To see a copy of this license,
+.\" visit <http://creativecommons.org/licenses/by-sa/4.0/>.
+
 .TH SLEEP 1
 
 .SH NAME