diff --git a/NOTICE b/NOTICE
new file mode 100644
index 000000000..365e87c82
--- /dev/null
+++ b/NOTICE
@@ -0,0 +1,25 @@
+Software license
+================
+
+Copyright 2017 Pilosa Corp.
+
+Licensed under the Apache License, Version 2.0 (the "License").
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+
+
+Third-party software licenses
+=============================
+
+The file /pilosa/roaring/btree.go is licensed under the BSD 3-Clause license,
+which can be found at:
+
+    https://github.com/cznic/b/blob/master/LICENSE
+
diff --git a/roaring/btree.go b/roaring/btree.go
index 1c6630a04..24fd76507 100644
--- a/roaring/btree.go
+++ b/roaring/btree.go
@@ -1,6 +1,7 @@
 // Copyright 2014 The b Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// license that can be found at:
+// https://github.com/cznic/b/blob/master/LICENSE
 
 package roaring