diff --git a/README.md b/README.md
index 28a730d31..0f64bdcbb 100644
--- a/README.md
+++ b/README.md
@@ -11,3 +11,9 @@ Contributions are always welcome, no matter how large or small. Before contribut
 please read the [code of conduct](code-of-conduct.md).
 
 See [Contributing](CONTRIBUTING.md).
+
+## License
+
+By contributing to opentracing.io, you agree that your contributions will be licensed
+under its [Apache 2.0 License](LICENSE.md).
+