Clarify 501c3 status is as an FSP

README.md

@@ -154,7 +154,7 @@ ArchiveBox is free for everyone to self-host, but we also provide support, secur
 
 > ***[Contact us](https://zulip.archivebox.io/#narrow/stream/167-enterprise/topic/welcome/near/1191102)** if your org wants help using ArchiveBox professionally.*  (we are also seeking [grant funding](https://github.com/ArchiveBox/ArchiveBox/issues/1126#issuecomment-1487431394))  
 > We offer: setup & support, CAPTCHA/ratelimit unblocking, SSO, audit logging/chain-of-custody, and more  
-> *ArchiveBox has 🏛️ 501(c)(3) [nonprofit status](https://hackclub.com/hcb/) and all our work supports open-source development.* 
+> *ArchiveBox is a 🏛️ 501(c)(3) [nonprofit FSP](https://hackclub.com/hcb/) and all our work supports open-source development.* 
 
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@@ -1609,7 +1609,7 @@ Extractors take the URL of a page to archive, write their output to the filesyst
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-<sup><i>ArchiveBox operates as a US 501(c)(3) nonprofit (sponsored by <a href="https://hackclub.com/hcb?ref=donation">HCB</a>), <a href="https://hcb.hackclub.com/donations/start/archivebox">direct donations</a> are tax-deductible.</i></sup>
+<sup><i>ArchiveBox operates as a US 501(c)(3) nonprofit <a href="https://en.wikipedia.org/wiki/Fiscal_sponsorship">FSP</a> (sponsored by <a href="https://hackclub.com/hcb?ref=donation">HCB</a>), <a href="https://hcb.hackclub.com/donations/start/archivebox">direct donations</a> are tax-deductible.</i></sup>
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