diff --git a/gtk/gtktextmark.h b/gtk/gtktextmark.h
index 5bddf92739..8b714bc25e 100644
--- a/gtk/gtktextmark.h
+++ b/gtk/gtktextmark.h
@@ -56,8 +56,6 @@
 
 G_BEGIN_DECLS
 
-/* The GtkTextMark data type */
-
 typedef struct _GtkTextMark      GtkTextMark;
 typedef struct _GtkTextMarkClass GtkTextMarkClass;
 
@@ -72,7 +70,8 @@ struct _GtkTextMark
 {
   GObject parent_instance;
 
-  gpointer GSEAL (segment);
+  /*< private >*/
+  gpointer segment;
 };
 
 struct _GtkTextMarkClass
@@ -86,14 +85,14 @@ struct _GtkTextMarkClass
   void (*_gtk_reserved4) (void);
 };
 
-GType        gtk_text_mark_get_type   (void) G_GNUC_CONST;
-
-void           gtk_text_mark_set_visible (GtkTextMark *mark,
-                                          gboolean     setting);
-gboolean       gtk_text_mark_get_visible (GtkTextMark *mark);
+GType                 gtk_text_mark_get_type         (void) G_GNUC_CONST;
 
 GtkTextMark          *gtk_text_mark_new              (const gchar *name,
-						      gboolean     left_gravity);
+                                                      gboolean     left_gravity);
+void                  gtk_text_mark_set_visible      (GtkTextMark *mark,
+                                                      gboolean     setting);
+gboolean              gtk_text_mark_get_visible      (GtkTextMark *mark);
+
 G_CONST_RETURN gchar* gtk_text_mark_get_name         (GtkTextMark *mark);
 gboolean              gtk_text_mark_get_deleted      (GtkTextMark *mark);
 GtkTextBuffer*        gtk_text_mark_get_buffer       (GtkTextMark *mark);
@@ -101,6 +100,4 @@ gboolean              gtk_text_mark_get_left_gravity (GtkTextMark *mark);
 
 G_END_DECLS
 
-#endif
-
-
+#endif  /* __GTK_TEXT_MARK_H__ */