diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -1,3 +1,13 @@
 # Rust poseidon hash implementation
 
 This package implements a [circomlib](https://github.com/iden3/circomlib/) and [circomlibjs](https://github.com/iden3/circomlibjs) compatible poseidon hash.
+
+## License
+
+Licensed and distributed under either of
+
+* MIT license: [LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT
+
+or
+
+* Apache License, Version 2.0, ([LICENSE-APACHEv2](LICENSE-APACHEv2) or http://www.apache.org/licenses/LICENSE-2.0) at your option. These files may not be copied, modified, or distributed except according to those terms.