Update README.md (#4335)

Author: zackrw

README.md

@@ -70,7 +70,9 @@ Finally, you may want to take a look at the [guides on our blog](https://blog.op
 
 This project is maintained by [OpenZeppelin](https://openzeppelin.com) with the goal of providing a secure and reliable library of smart contract components for the ecosystem. We address security through risk management in various areas such as engineering and open source best practices, scoping and API design, multi-layered review processes, and incident response preparedness.
 
-The security policy is detailed in [`SECURITY.md`](./SECURITY.md), and specifies how you can report security vulnerabilities, which versions will receive security patches, and how to stay informed about them. We run a [bug bounty program on Immunefi](https://immunefi.com/bounty/openzeppelin) to reward the responsible disclosure of vulnerabilities.
+The [OpenZeppelin Contracts Security Center](https://contracts.openzeppelin.com/security) contains more details about the secure development process.
+
+The security policy is detailed in [`SECURITY.md`](./SECURITY.md) as well, and specifies how you can report security vulnerabilities, which versions will receive security patches, and how to stay informed about them. We run a [bug bounty program on Immunefi](https://immunefi.com/bounty/openzeppelin) to reward the responsible disclosure of vulnerabilities.
 
 The engineering guidelines we follow to promote project quality can be found in [`GUIDELINES.md`](./GUIDELINES.md).