diff --git a/NOTICE b/NOTICE
index 99ea00db4..5c905a32a 100644
--- a/NOTICE
+++ b/NOTICE
@@ -55,8 +55,8 @@ The file /pilosa/lru/lru.go contains a redistribution of lru
     See the License for the specific language governing permissions and
     limitations under the License.
 
-The file /enterprise/b/btree.go contains a modified redistribution of b
-(https://github.com/cznic/b); the license follows:
+The files /enterprise/b/btree.go and /roaring/btree.go contain a modified
+redistribution of b (https://github.com/cznic/b); the license follows:
 
     Copyright (c) 2014 The b Authors. All rights reserved.
 
diff --git a/enterprise/enterprise.go b/enterprise/enterprise.go
index f69ef1dd7..a75223801 100644
--- a/enterprise/enterprise.go
+++ b/enterprise/enterprise.go
@@ -15,10 +15,11 @@
 // You should have received a copy of the GNU Affero General Public License
 // along with Pilosa Enterprise Edition.  If not, see <http://www.gnu.org/licenses/>.
 
-// Package enterprise injects enterprise implementations of various Pilosa
-// features when Pilosa is built with "ENTERPRISE=1 make install". These
-// features are dual-licensed separately from Pilosa community edition under the
-// AGPL and Pilosa's commercial license.
+// Package enterprise is now deprecated, and the functionality under
+// enterprise/b has been copied into roaring/. It existed to inject enterprise
+// implementations of various Pilosa features when Pilosa was built with
+// "ENTERPRISE=1 make install". These features were dual-licensed separately
+// from Pilosa community edition under the AGPL and Pilosa's commercial license.
 package enterprise
 
 import (
diff --git a/roaring/containers_btree.go b/roaring/containers_btree.go
index 887f5b9a9..95066fe03 100644
--- a/roaring/containers_btree.go
+++ b/roaring/containers_btree.go
@@ -1,19 +1,16 @@
-// Copyright (c) 2018 Pilosa Corp. All rights reserved.
+// Copyright (C) 2017-2018 Pilosa Corp. All rights reserved.
 //
-// This file is part of Pilosa Enterprise Edition.
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
 //
-// Pilosa Enterprise Edition is free software: you can redistribute it and/or modify
-// it under the terms of the GNU Affero General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
+//     http://www.apache.org/licenses/LICENSE-2.0
 //
-// Pilosa Enterprise Edition is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-// GNU Affero General Public License for more details.
-//
-// You should have received a copy of the GNU Affero General Public License
-// along with Pilosa Enterprise Edition.  If not, see <http://www.gnu.org/licenses/>.
+// 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.
 
 package roaring