diff --git a/LICENSE b/LICENSE
index 8919fa2..976992c 100644
--- a/LICENSE
+++ b/LICENSE
@@ -15,3 +15,5 @@ freely, subject to the following restrictions:
 3. This notice may not be removed or altered from any source distribution.
 
 Copyright (c) 2008 Greg Hewgill http://hewgill.com
+See individual files for information about modification to these files and
+additional copyright information.
diff --git a/dkim/__init__.py b/dkim/__init__.py
index 866727b..4423161 100644
--- a/dkim/__init__.py
+++ b/dkim/__init__.py
@@ -24,7 +24,7 @@
 # Contact: Brandon Long <blong@google.com>
 #
 # This has been modified from the original software.
-# Copyright (c) 2016, 2017 Scott Kitterman <scott@kitterman.com>
+# Copyright (c) 2016, 2017, 2018 Scott Kitterman <scott@kitterman.com>
 #
 # This has been modified from the original software.
 # Copyright (c) 2017 Valimail Inc
diff --git a/dkim/crypto.py b/dkim/crypto.py
index 305a630..2585a85 100644
--- a/dkim/crypto.py
+++ b/dkim/crypto.py
@@ -18,6 +18,7 @@
 #
 # This has been modified from the original software.
 # Copyright (c) 2011 William Grant <me@williamgrant.id.au>
+# Copyright (c) 2018 Scott Kitterman <scott@kitterman.com>
 
 __all__ = [
     'DigestTooLargeError',
diff --git a/dkim/tests/__init__.py b/dkim/tests/__init__.py
index ca65c13..e923974 100644
--- a/dkim/tests/__init__.py
+++ b/dkim/tests/__init__.py
@@ -19,6 +19,7 @@
 # This has been modified from the original software.
 # Copyright (c) 2016 Google, Inc.
 # Contact: Brandon Long <blong@google.com>
+# Copyright (c) 2018 Scott Kitterman <scott@kitterman.com>
 
 import unittest
 
diff --git a/dkim/tests/test_dkim_ed25519.py b/dkim/tests/test_dkim_ed25519.py
index f93f7bb..f549ce2 100644
--- a/dkim/tests/test_dkim_ed25519.py
+++ b/dkim/tests/test_dkim_ed25519.py
@@ -15,7 +15,7 @@
 # 3. This notice may not be removed or altered from any source distribution.
 #
 # Copyright (c) 2011 William Grant <me@williamgrant.id.au>
-# Copyright (c) 2017 Scott Kitterman <scott@kitterman.com>
+# Copyright (c) 2018 Scott Kitterman <scott@kitterman.com>
 
 import email
 import os.path
diff --git a/dknewkey.py b/dknewkey.py
index 3192f79..8eef204 100644
--- a/dknewkey.py
+++ b/dknewkey.py
@@ -18,7 +18,7 @@
 # Copyright (c) 2016 Google, Inc.
 # Contact: Brandon Long <blong@google.com>
 # Modified by Scott Kitterman <scott@kitterman.com>
-# Copyright (c) 2017 Scott Kitterman
+# Copyright (c) 2017,2018 Scott Kitterman
 
 """Generates new domainkeys pairs.