diff --git a/src/core_io.h b/src/core_io.h
index 26a1293d..adf74cce 100644
--- a/src/core_io.h
+++ b/src/core_io.h
@@ -1,3 +1,7 @@
+// Copyright (c) 2009-2014 The Bitcoin developers
+// Distributed under the MIT/X11 software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
 #ifndef __BITCOIN_CORE_IO_H__
 #define __BITCOIN_CORE_IO_H__
 
diff --git a/src/core_read.cpp b/src/core_read.cpp
index 9022ffaf..593eb2d0 100644
--- a/src/core_read.cpp
+++ b/src/core_read.cpp
@@ -1,3 +1,6 @@
+// Copyright (c) 2009-2014 The Bitcoin developers
+// Distributed under the MIT/X11 software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #include "core_io.h"
 #include "core.h"
diff --git a/src/core_write.cpp b/src/core_write.cpp
index d9e31ed8..37dd69f7 100644
--- a/src/core_write.cpp
+++ b/src/core_write.cpp
@@ -1,3 +1,6 @@
+// Copyright (c) 2009-2014 The Bitcoin developers
+// Distributed under the MIT/X11 software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #include "core_io.h"
 #include "univalue/univalue.h"