diff --git a/docs/emails/cryptography/4.md b/docs/emails/cryptography/4.md
index 5f783f9..53f16c0 100644
--- a/docs/emails/cryptography/4.md
+++ b/docs/emails/cryptography/4.md
@@ -4,6 +4,7 @@ title: Bitcoin P2P e-cash paper
 grand_parent: Emails
 parent: Cryptography Mailing List
 nav_order: 4
+date: 2008-11-06 20:15:40 UTC
 ---
 
 # Bitcoin P2P e-cash paper