diff --git a/sim/src/main.rs b/sim/src/main.rs
index d687483..fd5c016 100644
--- a/sim/src/main.rs
+++ b/sim/src/main.rs
@@ -1,3 +1,8 @@
+// Copyright (c) 2017-2019 Linaro LTD
+// Copyright (c) 2017-2019 JUUL Labs
+//
+// SPDX-License-Identifier: Apache-2.0
+
 use env_logger;
 
 use bootsim;