docs: add GTK_TREE_SORTABLE_*_COLUMN_ID to docs

1 files changed, 18 insertions, 0 deletions

diff --git a/gtk/gtktreesortable.h b/gtk/gtktreesortable.h
index ae3cabee8a..c9508b5c0c 100644
--- a/gtk/gtktreesortable.h
+++ b/gtk/gtktreesortable.h
@@ -35,6 +35,24 @@ G_BEGIN_DECLS
 #define GTK_IS_TREE_SORTABLE(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GTK_TYPE_TREE_SORTABLE))
 #define GTK_TREE_SORTABLE_GET_IFACE(obj)  (G_TYPE_INSTANCE_GET_INTERFACE ((obj), GTK_TYPE_TREE_SORTABLE, GtkTreeSortableIface))
 
+/**
+ * GTK_TREE_SORTABLE_DEFAULT_SORT_COLUMN_ID:
+ *
+ * The GTK_TREE_SORTABLE_DEFAULT_SORT_COLUMN_ID can be used to make a
+ * #GtkTreeSortable use the default sort function.
+ *
+ * See also gtk_tree_sortable_set_sort_column_id()
+ */
+
+/**
+ * GTK_TREE_SORTABLE_UNSORTED_SORT_COLUMN_ID:
+ *
+ * The GTK_TREE_SORTABLE_DEFAULT_SORT_COLUMN_ID can be used to make a
+ * #GtkTreeSortable use no sorting.
+ *
+ * See also gtk_tree_sortable_set_sort_column_id()
+ */
+
 enum {
   GTK_TREE_SORTABLE_DEFAULT_SORT_COLUMN_ID = -1,
   GTK_TREE_SORTABLE_UNSORTED_SORT_COLUMN_ID = -2