diff --git a/15.md b/15.md
index 11a90f8..2d62db8 100644
--- a/15.md
+++ b/15.md
@@ -147,7 +147,7 @@ Fields that are not self-explanatory:
 
 ## Checkout events
 
-All checkout events are sent as JSON strings using [NIP-17](17.md).
+All checkout events are signed then sent as [NIP-17](17.md) Private Direct Messages between `customer` and `merchant`. Every checkout event contains the event's details as JSON in the `content` field.
 
 The `merchant` and the `customer` can exchange JSON messages that represent different actions. Each `JSON` message `MUST` have a `type` field indicating the what the JSON represents. Possible types:
 
@@ -159,7 +159,7 @@ The `merchant` and the `customer` can exchange JSON messages that represent diff
 
 ### Event `30030` - Step 1: `customer` order
 
-The below JSON goes in content of a kind: `30019` event. 
+The below JSON goes in `content` of a kind: `30019` event. The event is signed, then sent to `merchant` in a [NIP-17](17.md) Private Direct Message.
 
 ```json
 {
@@ -189,9 +189,9 @@ _Open_: is `contact.nostr` required?
 
 ### Event `30031` - Step 2: `merchant` request payment
 
-Sent back from the merchant for payment. Any payment option is valid that the merchant can check.
+Sent from the `merchant` to the `customer` for payment. Any payment option is valid that the merchant can check.
 
-The below JSON goes in `content` of a kind: `30020` event.
+The below JSON goes in `content` of a kind: `30020` event. The event is signed, then sent to the `customer` in a [NIP-17](17.md) Private Direct Message.
 
 `payment_options`/`type` include:
 
@@ -226,7 +226,7 @@ The below JSON goes in `content` of a kind: `30020` event.
 
 Once payment has been received and processed.
 
-The below JSON goes in `content` of a kind: `30021` event.
+The below JSON goes in `content` of a kind: `30021` event.  The event is signed, then sent to the `customer` in a [NIP-17](17.md) Private Direct Message.
 
 ```json
 {
@@ -242,7 +242,7 @@ The below JSON goes in `content` of a kind: `30021` event.
 
 Once order has been shipped.
 
-The below JSON goes in `content` of a kind: `30021` event.
+The below JSON goes in `content` of a kind: `30021` event. The event is signed, then sent to the `customer` in a [NIP-17](17.md) Private Direct Message.
 
 ```json
 {