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-rw-r--r--api-merchant.rst2
1 files changed, 1 insertions, 1 deletions
diff --git a/api-merchant.rst b/api-merchant.rst
index 885a679e..2b1990e2 100644
--- a/api-merchant.rst
+++ b/api-merchant.rst
@@ -229,7 +229,7 @@ The following API are made available by the merchant's `backend` to the merchant
:query wtid: raw wire transfer identifier identifying the wire transfer (a base32-encoded value)
:query exchange: base URI of the exchange that made the wire transfer
- :query instance: identificative token of the merchant :ref:`instance <instances-lab>` which is being tracked.
+ :query instance: (optional) identificative token of the merchant :ref:`instance <instances-lab>` which is being tracked.
**Response:**