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diff --git a/src/boost/libs/contract/example/n1962/sum.cpp b/src/boost/libs/contract/example/n1962/sum.cpp
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+++ b/src/boost/libs/contract/example/n1962/sum.cpp
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+
+// Copyright (C) 2008-2018 Lorenzo Caminiti
+// Distributed under the Boost Software License, Version 1.0 (see accompanying
+// file LICENSE_1_0.txt or a copy at http://www.boost.org/LICENSE_1_0.txt).
+// See: http://www.boost.org/doc/libs/release/libs/contract/doc/html/index.html
+
+//[n1962_sum
+#include <boost/contract.hpp>
+#include <cassert>
+
+int sum(int count, int* array) {
+    int result;
+    boost::contract::check c = boost::contract::function()
+        .precondition([&] {
+            BOOST_CONTRACT_ASSERT(count % 4 == 0);
+        })
+    ;
+
+    result = 0;
+    for(int i = 0; i < count; ++i) result += array[i];
+    return result;
+}
+
+int main() {
+    int a[4] = {1, 2, 3, 4};
+    assert(sum(4, a) == 10);
+    return 0;
+}
+//]
+