diff --git a/graph_docs/kernel_optimization.dox b/graph_docs/kernel_optimization.dox
index 6d1f616538c52d4bd8cebdd764edfc473159af6c..66af03b0422c373bee9b21ddb7bbb0eb3c5899b8 100644
--- a/graph_docs/kernel_optimization.dox
+++ b/graph_docs/kernel_optimization.dox
@@ -33,7 +33,7 @@ void field_solve_example() {
         buffer[index] = static_cast<T> (2*index)/static_cast<T> (999)
                       - static_cast<T> (1);
     }
-    flow_control->set(buffer);
+    grid_position->set(buffer);
     
     auto indexed_particle = graph::index_1D(particle_positions,
                                             particle_index,