Advertise Availability of Security Vulnerability Notifications

Author: felixhandte

Diff for: SECURITY.md

@@ -5,3 +5,11 @@ Please do not open GitHub issues or pull requests - this makes the problem immed
 https://www.facebook.com/whitehat
 
 Meta's security team will triage your report and determine whether or not is it eligible for a bounty under our program.
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+# Receiving Vulnerability Notifications
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+In the case that a significant security vulnerability is reported to us or discovered by us---without being publicly known---we will, at our discretion, notify high-profile, high-exposure users of Zstandard ahead of our public disclosure of the issue and associated fix.
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+If you believe your project would benefit from inclusion in this list, please reach out to one of the maintainers.
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+<!-- Note to maintainers: this list is kept [here](https://fburl.com/wiki/cgc1l62x). -->