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diff --git a/src/service/nat/gnunet-service-nat_stun.h b/src/service/nat/gnunet-service-nat_stun.h
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+/*
+     This file is part of GNUnet.
+     Copyright (C) 2009, 2015, 2016 GNUnet e.V.
+
+     GNUnet is free software: you can redistribute it and/or modify it
+     under the terms of the GNU Affero General Public License as published
+     by the Free Software Foundation, either version 3 of the License,
+     or (at your option) any later version.
+
+     GNUnet 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
+     Affero General Public License for more details.
+
+     You should have received a copy of the GNU Affero General Public License
+     along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+     SPDX-License-Identifier: AGPL3.0-or-later
+ */
+/**
+ * This code provides some support for doing STUN transactions.  We
+ * receive the simplest possible packet as the STUN server and try
+ * to respond properly.
+ *
+ * All STUN packets start with a simple header made of a type,
+ * length (excluding the header) and a 16-byte random transaction id.
+ * Following the header we may have zero or more attributes, each
+ * structured as a type, length and a value (whose format depends
+ * on the type, but often contains addresses).
+ * Of course all fields are in network format.
+ *
+ * This code was based on ministun.c.
+ *
+ * @file nat/gnunet-service-nat_stun.h
+ * @brief Functions for STUN functionality
+ * @author Bruno Souza Cabral
+ */
+#ifndef GNUNET_SERVICE_NAT_STUN_H
+#define GNUNET_SERVICE_NAT_STUN_H
+
+#include "platform.h"
+
+/**
+ * Handle an incoming STUN response.  Do some basic sanity checks on
+ * packet size and content, try to extract information.
+ * At the moment this only processes BIND requests,
+ * and returns the externally visible address of the original
+ * request.
+ *
+ * @param data the packet
+ * @param len the length of the packet in @a data
+ * @param[out] arg sockaddr_in where we will set our discovered address
+ * @return #GNUNET_OK on success,
+ *         #GNUNET_NO if the packet is invalid (not a stun packet)
+ */
+int
+GNUNET_NAT_stun_handle_packet_ (const void *data,
+                                size_t len,
+                                struct sockaddr_in *arg);
+
+#endif