diff --git a/include/bluetooth/gatt.h b/include/bluetooth/gatt.h
index eb5002fb027..173f3c87548 100644
--- a/include/bluetooth/gatt.h
+++ b/include/bluetooth/gatt.h
@@ -680,8 +680,12 @@ ssize_t bt_gatt_attr_read_cpf(struct bt_conn *conn,
  *  all peer that have notification enabled via CCC otherwise do a direct
  *  notification only the given connection.
  *
+ *  The attribute object must be the so called Characteristic Value Descriptor,
+ *  its usually declared with BT_GATT_DESCRIPTOR after BT_GATT_CHARACTERISTIC
+ *  and before BT_GATT_CCC.
+ *
  *  @param conn Connection object.
- *  @param attr Attribute object.
+ *  @param attr Characteristic Value Descriptor attribute.
  *  @param data Pointer to Attribute data.
  *  @param len Attribute value length.
  */