diff --git a/boost_graph_cookbook_1/create_all_direct_neighbour_bundled_edges_and_vertices_subgraphs.impl b/boost_graph_cookbook_1/create_all_direct_neighbour_bundled_edges_and_vertices_subgraphs.impl
index 04fd6114..ec2021cd 100644
--- a/boost_graph_cookbook_1/create_all_direct_neighbour_bundled_edges_and_vertices_subgraphs.impl
+++ b/boost_graph_cookbook_1/create_all_direct_neighbour_bundled_edges_and_vertices_subgraphs.impl
@@ -2,15 +2,24 @@
 #include <vector>
 template <typename graph>
 std::vector<graph>
-create_all_direct_neighbour_bundled_edges_and_vertices_subgraphs(const graph g)
+create_all_direct_neighbour_bundled_edges_and_vertices_subgraphs(
+  const graph g,
+  const bool connect_neighours = false
+)
 {
   using vd = typename graph::vertex_descriptor;
 
   std::vector<graph> v;
   v.resize(boost::num_vertices(g));
   const auto vip = vertices(g);
-  std::transform(vip.first, vip.second, std::begin(v), [&g](const vd& d) {
-    return create_direct_neighbour_bundled_edges_and_vertices_subgraph(d, g);
+  std::transform(
+    vip.first,
+    vip.second,
+    std::begin(v),
+    [&g, connect_neighours](const vd& d) {
+    return create_direct_neighbour_bundled_edges_and_vertices_subgraph(
+      d, g, connect_neighours
+    );
   });
   return v;
 }
diff --git a/boost_graph_cookbook_1/create_all_direct_neighbour_bundled_edges_and_vertices_subgraphs_test.cpp b/boost_graph_cookbook_1/create_all_direct_neighbour_bundled_edges_and_vertices_subgraphs_test.cpp
index 012ddddc..19504460 100644
--- a/boost_graph_cookbook_1/create_all_direct_neighbour_bundled_edges_and_vertices_subgraphs_test.cpp
+++ b/boost_graph_cookbook_1/create_all_direct_neighbour_bundled_edges_and_vertices_subgraphs_test.cpp
@@ -30,11 +30,13 @@ BOOST_AUTO_TEST_CASE(
   {
     const auto v
       = create_all_direct_neighbour_bundled_edges_and_vertices_subgraphs(
-        create_bundled_edges_and_vertices_k3_graph());
+        create_bundled_edges_and_vertices_k3_graph(),
+        true // connect the neighbours
+      );
     BOOST_CHECK(v.size() == 3);
-    for (const auto g : v) {
-      BOOST_CHECK(boost::num_vertices(g) == 3);
-      BOOST_CHECK(boost::num_edges(g) == 3);
+    for (const auto& g : v) {
+      BOOST_CHECK_EQUAL(3, boost::num_vertices(g));
+      BOOST_CHECK_EQUAL(3, boost::num_edges(g));
       const my_bundled_vertex va("Red", "Not green", 1.0, 2.0);
       const my_bundled_vertex vb("Light red", "Not dark", 3.0, 4.0);
       const my_bundled_vertex vc("Orange", "Orangy", 5.0, 6.0);
diff --git a/boost_graph_cookbook_1/create_direct_neighbour_bundled_edges_and_vertices_subgraph_test.cpp b/boost_graph_cookbook_1/create_direct_neighbour_bundled_edges_and_vertices_subgraph_test.cpp
index caf4e11d..506a30be 100644
--- a/boost_graph_cookbook_1/create_direct_neighbour_bundled_edges_and_vertices_subgraph_test.cpp
+++ b/boost_graph_cookbook_1/create_direct_neighbour_bundled_edges_and_vertices_subgraph_test.cpp
@@ -41,9 +41,12 @@ BOOST_AUTO_TEST_CASE(
     const auto j = vip.second;
     for (auto i = vip.first; i != j; ++i) {
       const auto h
-        = create_direct_neighbour_bundled_edges_and_vertices_subgraph(*i, g);
-      BOOST_CHECK(boost::num_vertices(h) == 3);
-      BOOST_CHECK(boost::num_edges(h) == 3);
+        = create_direct_neighbour_bundled_edges_and_vertices_subgraph(
+          *i, g,
+          true // connect the neighbours
+        );
+      BOOST_CHECK_EQUAL(3, boost::num_vertices(h));
+      BOOST_CHECK_EQUAL(3, boost::num_edges(h));
       const auto v = get_my_bundled_vertexes(h);
       std::set<my_bundled_vertex> vertexes(std::begin(v), std::end(v));
       const auto e = get_my_bundled_edges(h);
@@ -54,12 +57,12 @@ BOOST_AUTO_TEST_CASE(
       const my_bundled_edge ea("Oxygen", "Air", 1.0, 2.0);
       const my_bundled_edge eb("Helium", "From tube", 3.0, 4.0);
       const my_bundled_edge ec("Stable temperature", "Here", 5.0, 6.0);
-      BOOST_CHECK(vertexes.count(va) == 1);
-      BOOST_CHECK(vertexes.count(vb) == 1);
-      BOOST_CHECK(vertexes.count(vc) == 1);
-      BOOST_CHECK(edges.count(ea) == 1);
-      BOOST_CHECK(edges.count(eb) == 1);
-      BOOST_CHECK(edges.count(ec) == 1);
+      BOOST_CHECK_EQUAL(1, vertexes.count(va));
+      BOOST_CHECK_EQUAL(1, vertexes.count(vb));
+      BOOST_CHECK_EQUAL(1, vertexes.count(vc));
+      BOOST_CHECK_EQUAL(1, edges.count(ea));
+      BOOST_CHECK_EQUAL(1, edges.count(eb));
+      BOOST_CHECK_EQUAL(1, edges.count(ec));
     }
   }
   // Path graph
diff --git a/boost_graph_cookbook_1/title_graph.png b/boost_graph_cookbook_1/title_graph.png
index 881eb9c3..f6d15dec 100644
Binary files a/boost_graph_cookbook_1/title_graph.png and b/boost_graph_cookbook_1/title_graph.png differ