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diff --git a/src/libknot/packet/query.h b/src/libknot/packet/query.h
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+/*!
+ * \file query.h
+ *
+ * \author Lubos Slovak <lubos.slovak@nic.cz>
+ *
+ * \brief API for manipulating queries.
+ *
+ * \addtogroup libknot
+ * @{
+ */
+/*  Copyright (C) 2011 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _KNOT_QUERY_H_
+#define _KNOT_QUERY_H_
+
+#include <stdint.h>
+#include <string.h>
+
+#include "packet/packet.h"
+#include "dname.h"
+#include "rrset.h"
+#include "edns.h"
+
+/*----------------------------------------------------------------------------*/
+/*!
+ * \brief Checks if DNSSEC was requested in the query (i.e. the DO bit was set).
+ *
+ * \param query Packet where the parsed query is stored.
+ *
+ * \retval 0 if the DO bit was not set in the query, or the query is not yet
+ *         parsed.
+ * \retval > 0 if DO bit was set in the query.
+ */
+int knot_query_dnssec_requested(const knot_packet_t *query);
+
+/*!
+ * \brief Checks if NSID was requested in the query (i.e. the NSID option was
+ *        present in the query OPT RR).
+ *
+ * \param query Packet where the parsed query is stored.
+ *
+ * \retval 0 if the NSID option was not present in the query, or the query is
+ *         not yet parsed.
+ * \retval > 0 if the NSID option was present in the query.
+ */
+int knot_query_nsid_requested(const knot_packet_t *query);
+
+int knot_query_edns_supported(const knot_packet_t *query);
+
+//int knot_query_set_qname(knot_packet_t *query, const knot_dname_t *qname);
+
+//int knot_query_set_qtype(knot_packet_t *query, uint16_t qtype);
+
+//int knot_query_set_qclass(knot_packet_t *query, uint16_t qclass);
+
+int knot_query_init(knot_packet_t *query);
+
+int knot_query_set_question(knot_packet_t *query,
+                              const knot_question_t *question);
+
+int knot_query_set_opcode(knot_packet_t *query, uint8_t opcode);
+
+/*!
+ * \brief Adds a RRSet to the Authority section of the query.
+ *
+ * \param query Query to add the RRSet into.
+ * \param rrset RRSet to be added.
+ *
+ * \retval KNOT_EOK if successful, or the RRSet was already in the query.
+ * \retval KNOT_ENOMEM
+ * \retval KNOT_ESPACE
+ */
+int knot_query_add_rrset_authority(knot_packet_t *query,
+                                   const knot_rrset_t *rrset);
+
+
+#endif /* _KNOT_QUERY_H_ */
+
+/*! @} */