diff --git a/README.md b/README.md
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+++ b/README.md
@@ -28,14 +28,43 @@ Contribute to XGBoost
XGBoost has been developed and used by a group of active community members. Your help is very valuable to make the package better for everyone.
Checkout the [Community Page](https://xgboost.ai/community)
-Sponsors
---------
-Become a sponsor and get a logo here. See details at [Sponsoring the XGBoost Project](https://xgboost.ai/sponsors). The funds are used to defray the cost of continuous integration and testing infrastructure (https://xgboost-ci.net).
+## Contributors
-[](https://aws.amazon.com/)
-[](https://www.nvidia.com/en-us/)
+This project exists thanks to all the people who contribute.
+
Reference
---------
- Tianqi Chen and Carlos Guestrin. [XGBoost: A Scalable Tree Boosting System](http://arxiv.org/abs/1603.02754). In 22nd SIGKDD Conference on Knowledge Discovery and Data Mining, 2016
- XGBoost originates from research project at University of Washington.
+
+Sponsors
+--------
+Become a sponsor and get a logo here. See details at [Sponsoring the XGBoost Project](https://xgboost.ai/sponsors). The funds are used to defray the cost of continuous integration and testing infrastructure (https://xgboost-ci.net).
+
+## Open Source Collective sponsors
+[](#backers) [](#sponsors)
+
+### Sponsors
+[[Become a sponsor](https://opencollective.com/xgboost#sponsor)]
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+### Backers
+[[Become a backer](https://opencollective.com/xgboost#backer)]
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+
+## Other sponsors
+The sponsors in this list are donating cloud hours in lieu of cash donation.
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+