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-rw-r--r--src/include/taler_testing_lib.h4
1 files changed, 3 insertions, 1 deletions
diff --git a/src/include/taler_testing_lib.h b/src/include/taler_testing_lib.h
index 99be529b3..2753b36cb 100644
--- a/src/include/taler_testing_lib.h
+++ b/src/include/taler_testing_lib.h
@@ -1384,7 +1384,9 @@ TALER_TESTING_cmd_refund (const char *label,
* @param label the command label
* @param expected_response_code expected HTTP status code
* @param coin_reference reference to any command which
- * offers a coin & reserve private key.
+ * offers a coin and reserve private key. May specify
+ * the index of the coin using "$LABEL#$INDEX" syntax.
+ * Here, $INDEX must be a non-negative number.
* @param amount denomination to pay back.
*
* @return the command.