diff --git a/src/init.s b/src/init.s
index 9404817..4dff02f 100644
--- a/src/init.s
+++ b/src/init.s
@@ -1,3 +1,6 @@
+// Copyright (c) 2015, edef <edef@edef.eu>
+// See LICENSE file that comes with this distribution.
+
 /// initialise a new context
 /// arguments: rdi: stack pointer,
 ///            rsi: function pointer,
diff --git a/src/swap.s b/src/swap.s
index da9dcd1..e7ae3ac 100644
--- a/src/swap.s
+++ b/src/swap.s
@@ -1,3 +1,6 @@
+// Copyright (c) 2015, edef <edef@edef.eu>
+// See LICENSE file that comes with this distribution.
+
 /// switch to a new context
 /// arguments: rdi: stack pointer pointer