diff --git a/15.md b/15.md
index f8df3284..9bddb750 100644
--- a/15.md
+++ b/15.md
@@ -204,6 +204,25 @@ The below json goes in `content` of [NIP04](https://github.com/nostr-protocol/ni
     "shipped": <Bool, true/false has been shipped>,
 }
 ```
+## Customize Marketplace
+Create a customized user experience using the `naddr` from [NIP-19](https://github.com/nostr-protocol/nips/blob/master/19.md#shareable-identifiers-with-extra-metadata). Include relays, merchants, color, banner, etc...
+
+### Event `30019`: Create or update marketplace UI/UX
+
+**Event Content**:
+```json
+{
+    "name": <String (optional), market name>,
+    "about": <String (optional), market description>,
+    "ui": {
+      "picture": <String (optional), market logo image URL>,
+      "banner": <String (optional), market logo banner URL>,
+      "theme": <String (optional), market theme>
+    },
+    "merchants": <[String] (optional), array of pubkeys>,
+    ...
+}
+```
 
 ## Customer support events