diff --git a/sim/src/caps.rs b/sim/src/caps.rs
index 639894b..a63a343 100644
--- a/sim/src/caps.rs
+++ b/sim/src/caps.rs
@@ -1,3 +1,9 @@
+// Copyright (c) 2017-2019 Linaro LTD
+// Copyright (c) 2019 JUUL Labs
+// Copyright (c) 2019 Arm Limited
+//
+// SPDX-License-Identifier: Apache-2.0
+
 // Query the bootloader's capabilities.
 
 #[repr(u32)]