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diff --git a/hicn-plugin/src/network/interest_hitpit.h b/hicn-plugin/src/network/interest_hitpit.h
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+++ b/hicn-plugin/src/network/interest_hitpit.h
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+/*
+ * Copyright (c) 2017-2020 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef __HICN_INTEREST_HITPIT_H__
+#define __HICN_INTEREST_HITPIT_H__
+
+#include <vlib/vlib.h>
+#include <vnet/vnet.h>
+
+#include "pcs.h"
+
+/**
+ * @file interest_hitpit.h
+ *
+ * This is the node encoutered by interest packets after the hicn-interest-pcslookup.
+ * This node aggregates an interest in the PIT or forward it in case of a retransmission.
+ * If the interest must be retransmitted the next vlib node will be on of the
+ * hicn6-face-output or hicn4-face-output nodes. If the pit entry is expired the next vlib node
+ * will be the hicn-strategy node, otherwise the vlib buffer is dropped.
+ */
+
+
+/*
+ * Node context data; we think this is per-thread/instance
+ */
+typedef struct hicn_interest_hitpit_runtime_s
+{
+  int id;
+  hicn_pit_cs_t *pitcs;
+} hicn_interest_hitpit_runtime_t;
+
+/* Trace context struct */
+typedef struct
+{
+  u32 next_index;
+  u32 sw_if_index;
+  u8 pkt_type;
+} hicn_interest_hitpit_trace_t;
+
+typedef enum
+{
+  HICN_INTEREST_HITPIT_NEXT_INTEREST_HITCS,
+  HICN_INTEREST_HITPIT_NEXT_STRATEGY,
+  HICN_INTEREST_HITPIT_NEXT_FACE4_OUTPUT,
+  HICN_INTEREST_HITPIT_NEXT_FACE6_OUTPUT,
+  HICN_INTEREST_HITPIT_NEXT_ERROR_DROP,
+  HICN_INTEREST_HITPIT_N_NEXT,
+} hicn_interest_hitpit_next_t;
+
+#endif /* // __HICN_INTEREST_HITPIT_H__ */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables: eval: (c-set-style "gnu") End:
+ */