diff --git a/include/GToolkit.h b/include/GToolkit.h
index b8d89e2..35c06c0 100644
--- a/include/GToolkit.h
+++ b/include/GToolkit.h
@@ -1,4 +1,4 @@
-/* GToolkit.h */
+/* $Id$ */
 
 
 
@@ -8,6 +8,7 @@
 # include "GToolkit/GWindow.h"
 
 
+/* GToolkit */
 /* functions */
 int g_init(void);
 int g_quit(void);
diff --git a/include/GToolkit/GWidget.h b/include/GToolkit/GWidget.h
index dcaf859..92d8bbd 100644
--- a/include/GToolkit/GWidget.h
+++ b/include/GToolkit/GWidget.h
@@ -1,4 +1,4 @@
-/* GToolkit/GWidget.h */
+/* $Id$ */
 
 
 
@@ -6,6 +6,7 @@
 # define GTOOLKIT_GWIDGET_H
 
 
+/* GWidget */
 /* types */
 typedef struct _GWidget GWidget;
 
diff --git a/include/GToolkit/GWindow.h b/include/GToolkit/GWindow.h
index e331e1e..ec94248 100644
--- a/include/GToolkit/GWindow.h
+++ b/include/GToolkit/GWindow.h
@@ -1,4 +1,4 @@
-/* GToolkit/GWindow.h */
+/* $Id$ */
 
 
 
@@ -6,11 +6,15 @@
 # define GTOOLKIT_GWINDOW_H
 
 
+/* GWindow */
 /* types */
 typedef struct _GWindow GWindow;
 
 
 /* functions */
-GWindow * gwindow_new();
+GWindow * gwindow_new(void);
+
+/* useful */
+void gwindow_show(GWindow * gwindow);
 
 #endif /* !GTOOLKIT_GWINDOW_H */
diff --git a/src/gtoolkit.c b/src/gtoolkit.c
index e98663f..8b6094d 100644
--- a/src/gtoolkit.c
+++ b/src/gtoolkit.c
@@ -7,10 +7,19 @@
 #include "common.h"
 
 
+/* GToolkit */
+/* private */
+/* variables */
 static int _gt_init = 0; /* FIXME pointer(s) to function(s) instead? */
+
+
+/* protected */
+/* variables */
 GToolkit gt;
 
 
+/* public */
+/* functions */
 /* g_init */
 int g_init(void)
 {
diff --git a/src/gwindow.c b/src/gwindow.c
index 95df359..cf6e251 100644
--- a/src/gwindow.c
+++ b/src/gwindow.c
@@ -8,6 +8,8 @@
 #include "GToolkit/GWindow.h"
 
 
+/* GWindow */
+/* private */
 /* types */
 struct _GWindow
 {
@@ -19,6 +21,7 @@ struct _GWindow
 };
 
 
+/* public */
 /* functions */
 /* gwindow_new */
 GWindow * gwindow_new(void)
@@ -45,6 +48,7 @@ GWindow * gwindow_new(void)
 }
 
 
+/* gwindow_delete */
 void gwindow_delete(GWindow * gwindow)
 {
 	if(g_alloced(gwindow) != gwindow)
@@ -55,8 +59,9 @@ void gwindow_delete(GWindow * gwindow)
 
 
 /* useful */
+/* gwindow_show */
 void gwindow_show(GWindow * gwindow)
-	/* FIXME generic widget_show() instead */
+	/* FIXME accept flags (focus...) */
 {
 	XMapRaised(gt.display, gwindow->window);
 	glXMakeCurrent(gt.display, gwindow->window, gwindow->context);