diff --git a/demos/gtk-demo/tree_store.c b/demos/gtk-demo/tree_store.c
index 1d599a1..b6ad0b4 100644
--- a/demos/gtk-demo/tree_store.c
+++ b/demos/gtk-demo/tree_store.c
@@ -67,13 +67,12 @@ static TreeItem C[] = {{ "H", H }, { NULL }};
 static TreeItem B[] = {{ "E", E }, { "F", F }, { "G", G }, { NULL }};
 static TreeItem A[] = {{ "C", C }, { "D", D }, { NULL }};
 static TreeItem R[] = {{ "A", A }, { "B", B }, { NULL }};
-static TreeItem O[] = {{ "R", R }, { NULL }}; //  Artefact added for symetry
+static TreeItem O[] = {{ "R", R }, { NULL }}; //  Artefact added for symmetry
 
-//  iterate_node(model, item_0, item_1, &iter, &child_iter);
 static void iterate_node(GtkTreeStore *model,
-             GtkTreeIter *iter_children,
-             TreeItem *item_children,
-             GtkTreeIter *iter_parent)
+                         GtkTreeIter *iter_children,
+                         TreeItem *item_children,
+                         GtkTreeIter *iter_parent)
 {
   gtk_tree_store_append (model, iter_children, iter_parent);
   gtk_tree_store_set (model, iter_children, COLUMN_0, item_children->label, -1);