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diff --git a/src/lib/eval/dependency.h b/src/lib/eval/dependency.h
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+++ b/src/lib/eval/dependency.h
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+// Copyright (C) 2018 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 DEPENDENCY_H
+#define DEPENDENCY_H
+
+#include <eval/token.h>
+#include <string>
+
+namespace isc {
+namespace dhcp {
+
+/// @brief Checks dependency on a token.
+///
+/// It checks if the token is a TokenMember for the given class.
+///
+/// @param token A pointer to the token.
+/// @param name The client class name.
+/// @return true if token points to a TokenMember of name, false if not.
+bool dependOnClass(const TokenPtr& token, const std::string& name);
+
+/// @brief Checks dependency on an expression.
+///
+/// It checks if a member of the expression depends on the given class.
+///
+/// @param expr An expression.
+/// @param name The client class name.
+/// @return true if a member of expr depends on name, false if not.
+bool dependOnClass(const ExpressionPtr& expr, const std::string& name);
+
+}; // end of isc::dhcp namespace
+}; // end of isc namespace
+
+#endif