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-rw-r--r--api-merchant.rst6
1 files changed, 5 insertions, 1 deletions
diff --git a/api-merchant.rst b/api-merchant.rst
index 81cf5fc7..0dbd1006 100644
--- a/api-merchant.rst
+++ b/api-merchant.rst
@@ -466,7 +466,11 @@ The `contract` must have the following structure:
// Optional identifier chosen by the merchant,
// which allows the wallet to detect if it is buying
// a contract where it already has paid for the same
- // product instance.
+ // product instance. NOTE: this information is mainly
+ // needed when the customer visits a shared fulfillment
+ // URL about a product they already paid for, so that
+ // the wallet can reuse the same coins used in the first
+ // place.
repurchase_correlation_id?: string;
// URL that the wallet will navigate to after the customer