diff --git a/README.mediawiki b/README.mediawiki
index b488b10e..ad6a4b00 100644
--- a/README.mediawiki
+++ b/README.mediawiki
@@ -386,6 +386,14 @@ Those proposing changes should consider that ultimately consent may rest with th
 | Standard
 | Final
 |- style="background-color: #ffffcf"
+| [[bip-0078.mediawiki|79]]
+| Applications
+| Bustapay :: A Simple Payjoin Proposal
+| Nicolas Dorier
+| Informational
+| Proposed
+|-
+|- style="background-color: #ffffcf"
 | [[bip-0079.mediawiki|79]]
 | Applications
 | Bustapay :: a practical coinjoin protocol
diff --git a/bip-xxxx.mediawiki b/bip-0078.mediawiki
similarity index 99%
rename from bip-xxxx.mediawiki
rename to bip-0078.mediawiki
index c9d2d085..2b29f165 100644
--- a/bip-xxxx.mediawiki
+++ b/bip-0078.mediawiki
@@ -1,11 +1,11 @@
 <pre>
-  BIP: ?
+  BIP: 78
   Layer: Applications
   Title: A Simple Payjoin Proposal
   Author: Nicolas Dorier <nicolas.dorier@gmail.com>
   Replaces: 79
   Comments-Summary: No comments yet.
-  Comments-URI: https://github.com/bitcoin/bips/wiki/Comments:BIP-X
+  Comments-URI: https://github.com/bitcoin/bips/wiki/Comments:BIP-0078
   Status: Draft
   Type: Standards Track
   Created: 2019-05-01