diff --git a/COPYRIGHT b/COPYRIGHT
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+++ b/COPYRIGHT
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+Copyrights in the "pairing" library are retained by their contributors. No
+copyright assignment is required to contribute to the "pairing" library.
+
+The "pairing" library is licensed under either of
+
+ * Apache License, Version 2.0, (see ./LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
+ * MIT license (see ./LICENSE-MIT or http://opensource.org/licenses/MIT)
+
+at your option.
+
+Unless you explicitly state otherwise, any contribution intentionally
+submitted for inclusion in the work by you, as defined in the Apache-2.0
+license, shall be dual licensed as above, without any additional terms or
+conditions.