Note on nip-22 about moving old posts to a new relay

22.md

@@ -26,6 +26,9 @@ The event `created_at` field is just a unix timestamp and can be set to a time i
 
 A wide adoption of this nip could create a better user experience as it would decrease the amount of events that appear wildly out of order or even from impossible dates in the distant past or future.
 
+Keep in mind that there is a use case where a user migrates their old posts onto a new relay. If a relay rejects events that were not recently created, it cannot serve this use case.
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 Python Example
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