diff --git a/crates/matrix-sdk/src/attachment.rs b/crates/matrix-sdk/src/attachment.rs
index 21b2b7fbb..591aaf6f1 100644
--- a/crates/matrix-sdk/src/attachment.rs
+++ b/crates/matrix-sdk/src/attachment.rs
@@ -1,3 +1,17 @@
+// Copyright 2022 Kévin Commaille
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 use std::io::Read;
 #[cfg(feature = "image_proc")]
 use std::io::{BufRead, Cursor, Seek};