diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..32a35b8
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2018 Christoph Hagen
+
+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.
\ No newline at end of file
diff --git a/README.md b/README.md
index e8dbb0d..f0b5780 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # CCurve25519
 
-This repository contains a library for Curve25519 functions for the Swift Package Manager.
+This repository makes the C-library of [Curve25519](https://en.wikipedia.org/wiki/Curve25519) functions available in Swift through the [Swift Package Manager](https://swift.org/package-manager/).
 
 ## Usage
 
@@ -9,3 +9,11 @@ Specify the dependency in your `Package.swift` file:
 ````swift
 .package(url: "https://github.com/christophhagen/CCurve25519.git", .upToNextMinor(from: "1.0"))
 ````
+
+## Attribution
+
+The C files are taken without alteration from [libsignal-protocol-c](https://github.com/signalapp/libsignal-protocol-c).
+
+## License
+
+MIT.