diff --git a/loader_example.cc b/loader_example.cc
index e56e104..0d6d7ad 100644
--- a/loader_example.cc
+++ b/loader_example.cc
@@ -145,6 +145,9 @@ static void PrintInfo(const tinyobj::attrib_t& attrib,
     assert(shapes[i].mesh.num_face_vertices.size() ==
            shapes[i].mesh.material_ids.size());
 
+    assert(shapes[i].mesh.num_face_vertices.size() ==
+           shapes[i].mesh.smoothing_group_ids.size());
+
     printf("shape[%ld].num_faces: %lu\n", static_cast<long>(i),
            static_cast<unsigned long>(shapes[i].mesh.num_face_vertices.size()));
 
@@ -165,6 +168,8 @@ static void PrintInfo(const tinyobj::attrib_t& attrib,
 
       printf("  face[%ld].material_id = %d\n", static_cast<long>(f),
              shapes[i].mesh.material_ids[f]);
+      printf("  face[%ld].smoothing_group_id = %d\n", static_cast<long>(f),
+             shapes[i].mesh.smoothing_group_ids[f]);
 
       index_offset += fnum;
     }