diff --git a/gtk/gtktreemodel.c b/gtk/gtktreemodel.c
index 675f10bf73..5f01e6d791 100644
--- a/gtk/gtktreemodel.c
+++ b/gtk/gtktreemodel.c
@@ -1123,7 +1123,7 @@ gtk_tree_model_get_path (GtkTreeModel *tree_model,
  * @tree_model: A #GtkTreeModel.
  * @iter: The #GtkTreeIter.
  * @column: The column to lookup the value at.
- * @value: An empty #GValue to set.
+ * @value: (inout) (transfer none) An empty #GValue to set.
  *
  * Initializes and sets @value to that at @column.
  * When done with @value, g_value_unset() needs to be called 
diff --git a/gtk/gtktreestore.c b/gtk/gtktreestore.c
index b7fcda89f7..026ee39e1c 100644
--- a/gtk/gtktreestore.c
+++ b/gtk/gtktreestore.c
@@ -325,7 +325,7 @@ gtk_tree_store_newv (gint   n_columns,
  * gtk_tree_store_set_column_types:
  * @tree_store: A #GtkTreeStore
  * @n_columns: Number of columns for the tree store
- * @types: An array of #GType types, one for each column
+ * @types: (array length=n_columns): An array of #GType types, one for each column
  * 
  * This function is meant primarily for #GObjects that inherit from 
  * #GtkTreeStore, and should only be used when constructing a new