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diff --git a/bip-0070.mediawiki b/bip-0070.mediawiki
index 692d7f0..1969d4d 100644
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+++ b/bip-0070.mediawiki
@@ -153,6 +153,7 @@ after the time of the payment request. After that time has expired, parties must
If the customer authorizes payment, then the Bitcoin client:
# Creates and signs one or more transactions that satisfy (pay in full) PaymentDetails.outputs
+# Validate that customer's system unix time (UTC) is still before PaymentDetails.expires. If it is not, the payment should be cancelled.
# Broadcast the transactions on the Bitcoin p2p network.
# If PaymentDetails.payment_url is specified, POST a Payment message to that URL. The Payment message is serialized and sent as the body of the POST request.