diff --git a/src/smsutil.c b/src/smsutil.c
index 8ee53523..22c70cff 100644
--- a/src/smsutil.c
+++ b/src/smsutil.c
@@ -2830,6 +2830,9 @@ static inline GSList *sms_list_append(GSList *l, const struct sms *in)
  * Returns a list of sms messages in order.  If ref_offset is given,
  * then the ref_offset contains the reference number offset or 0
  * if no concatenation took place.
+ *
+ * @use_delivery_reports: value for the Status-Report-Request field
+ *     (23.040 3.2.9, 9.2.2.2)
  */
 GSList *sms_text_prepare(const char *utf8, guint16 ref,
 				gboolean use_16bit, int *ref_offset,