diff --git a/README.md b/README.md
index 7cbc9862..761f2d98 100644
--- a/README.md
+++ b/README.md
@@ -312,7 +312,12 @@ Tile38 uses the [Redis RESP](http://redis.io/topics/protocol) protocol natively.
 - Scala: [scala-redis](https://github.com/debasishg/scala-redis)
 - Swift: [Redbird](https://github.com/czechboy0/Redbird)
 
+## Special thanks
+
+[Vladimir Agafonkin](https://github.com/mourner) for the exceptional R-Tree indexing implementation [RBush](https://github.com/mourner/rbush). It gives Tile38 a little extra pep!
+
 ## Contact
+
 Josh Baker [@tidwall](http://twitter.com/tidwall)
 
 ## License
diff --git a/index/rtreebase/base.go b/index/rtreebase/base.go
index c1594803..cfc70d71 100644
--- a/index/rtreebase/base.go
+++ b/index/rtreebase/base.go
@@ -1,3 +1,29 @@
+// Package rtreebase
+// This package is a port of the fantastic RBush project by Vladimir Agafonkin.
+// https://github.com/mourner/rbush
+//
+// MIT License
+//
+// Copyright (c) 2016 Vladimir Agafonkin
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
 package rtreebase
 
 import (
diff --git a/index/rtreebase/knn.go b/index/rtreebase/knn.go
index 8ac05935..615962d0 100644
--- a/index/rtreebase/knn.go
+++ b/index/rtreebase/knn.go
@@ -1,3 +1,29 @@
+// Package rtreebase
+// This package is a port of the fantastic RBush project by Vladimir Agafonkin.
+// https://github.com/mourner/rbush
+//
+// MIT License
+//
+// Copyright (c) 2016 Vladimir Agafonkin
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
 package rtreebase
 
 import "github.com/tidwall/tinyqueue"
diff --git a/index/rtreebase/load.go b/index/rtreebase/load.go
index 413c3e64..1010f0a3 100644
--- a/index/rtreebase/load.go
+++ b/index/rtreebase/load.go
@@ -1,3 +1,29 @@
+// Package rtreebase
+// This package is a port of the fantastic RBush project by Vladimir Agafonkin.
+// https://github.com/mourner/rbush
+//
+// MIT License
+//
+// Copyright (c) 2016 Vladimir Agafonkin
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
 package rtreebase
 
 import "math"