Update section contribution
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## Contributing
-Please feel free to contribute. We are always happy to encourage new committers to the project.
+Please feel free to contribute. We are always happy to encourage new committers to the project.
+The Apache Software foundation requires that any contributor has signed the ICLA (Individual Contributor License Agreement).
+
+Find an overview, more information and how-tos [here](http://www.apache.org/licenses/contributor-agreements.html#clas).
## Authors
