diff --git a/rslib/src/io.rs b/rslib/src/io.rs
index c9e549331..aa3204021 100644
--- a/rslib/src/io.rs
+++ b/rslib/src/io.rs
@@ -1,3 +1,6 @@
+// Copyright: Ankitects Pty Ltd and contributors
+// License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
+
 use std::path::Path;
 
 use tempfile::NamedTempFile;