diff --git a/src/assembler.h b/src/assembler.h
index ca7926965b..cfaa0d5b59 100644
--- a/src/assembler.h
+++ b/src/assembler.h
@@ -1,3 +1,13 @@
+/* Copyright (c) 2008, Avian Contributors
+
+   Permission to use, copy, modify, and/or distribute this software
+   for any purpose with or without fee is hereby granted, provided
+   that the above copyright notice and this permission notice appear
+   in all copies.
+
+   There is NO WARRANTY for this software.  See license.txt for
+   details. */
+
 #ifndef ASSEMBLER_H
 #define ASSEMBLER_H
 
diff --git a/src/boot.cpp b/src/boot.cpp
index 7673e51735..e3f91f6c0d 100644
--- a/src/boot.cpp
+++ b/src/boot.cpp
@@ -1,3 +1,13 @@
+/* Copyright (c) 2008, Avian Contributors
+
+   Permission to use, copy, modify, and/or distribute this software
+   for any purpose with or without fee is hereby granted, provided
+   that the above copyright notice and this permission notice appear
+   in all copies.
+
+   There is NO WARRANTY for this software.  See license.txt for
+   details. */
+
 #include "stdint.h"
 #include "stdlib.h"
 
diff --git a/src/x86.cpp b/src/x86.cpp
index 9ee58700fe..6b825ef4c8 100644
--- a/src/x86.cpp
+++ b/src/x86.cpp
@@ -1,3 +1,13 @@
+/* Copyright (c) 2008, Avian Contributors
+
+   Permission to use, copy, modify, and/or distribute this software
+   for any purpose with or without fee is hereby granted, provided
+   that the above copyright notice and this permission notice appear
+   in all copies.
+
+   There is NO WARRANTY for this software.  See license.txt for
+   details. */
+
 #include "assembler.h"
 #include "vector.h"