diff --git a/notebooks/experimental/boxcat.py b/notebooks/experimental/boxcat.py
index 98ab3425..6dd1fa26 100644
--- a/notebooks/experimental/boxcat.py
+++ b/notebooks/experimental/boxcat.py
@@ -1,3 +1,7 @@
+# Copyright 2014, Sandia Corporation. Under the terms of Contract
+# DE-AC04-94AL85000 with Sandia Corporation, the U.S. Government retains certain
+# rights in this software.
+
 import copy
 
 import toyplot.units
diff --git a/notebooks/experimental/domcat.py b/notebooks/experimental/domcat.py
index 7afb1654..cf9ce43a 100644
--- a/notebooks/experimental/domcat.py
+++ b/notebooks/experimental/domcat.py
@@ -1,3 +1,7 @@
+# Copyright 2014, Sandia Corporation. Under the terms of Contract
+# DE-AC04-94AL85000 with Sandia Corporation, the U.S. Government retains certain
+# rights in this software.
+
 import copy
 import io
 import xml.etree.ElementTree as xml