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diff --git a/src/lib/eval/evaluate.h b/src/lib/eval/evaluate.h
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+++ b/src/lib/eval/evaluate.h
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+// Copyright (C) 2015-2017 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef EVALUATE_H
+#define EVALUATE_H
+
+#include <eval/token.h>
+#include <string>
+
+namespace isc {
+namespace dhcp {
+
+/// @brief Evaluate a RPN expression for a v4 or v6 packet and return
+///        a true or false decision
+///
+/// @param expr the RPN expression, i.e., a vector of parsed tokens
+/// @param pkt  The v4 or v6 packet
+/// @return the boolean decision
+/// @throw EvalStackError if there is not exactly one element on the value
+///        stack at the end of the evaluation
+/// @throw EvalTypeError if the value at the top of the stack at the
+///        end of the evaluation is not "false" or "true"
+bool evaluateBool(const Expression& expr, Pkt& pkt);
+
+
+std::string evaluateString(const Expression& expr, Pkt& pkt);
+
+}; // end of isc::dhcp namespace
+}; // end of isc namespace
+
+#endif