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-rw-r--r--src/include/taler_exchange_service.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/include/taler_exchange_service.h b/src/include/taler_exchange_service.h
index bd8e281d3..c097dff1a 100644
--- a/src/include/taler_exchange_service.h
+++ b/src/include/taler_exchange_service.h
@@ -1403,7 +1403,8 @@ struct TALER_EXCHANGE_PaybackHandle;
* @param http_status HTTP response code, #MHD_HTTP_OK (200) for successful status request
* 0 if the exchange's reply is bogus (fails to follow the protocol)
* @param ec taler-specific error code, #TALER_EC_NONE on success
- * @param amount amount the exchange will wire back for this coin
+ * @param amount amount the exchange will wire back for this coin,
+ * on error the total balance remaining, or NULL
* @param timestamp what time did the exchange receive the /payback request
* @param reserve_pub public key of the reserve receiving the payback
* @param full_response full response from the exchange (for logging, in case of errors)