diff --git a/gtkarea/area.c b/gtkarea/area.c
index 7c9aad12..68d0bb48 100644
--- a/gtkarea/area.c
+++ b/gtkarea/area.c
@@ -37,6 +37,7 @@ static void updateScroll(areaWidget *a)
 		ap->clientWidth / pixelsPer,
 		ap->clientWidth / pixelsPer);
 
+	// TODO sometimes changing htis results inn no change until the window is significantly resized
 	(*(ap->ah->VScrollConfig))(ap->ah, ap->a,
 		&count, &pixelsPer);
 	gtk_adjustment_configure(ap->va,
@@ -235,3 +236,8 @@ GtkWidget *newArea(uiAreaHandler *ah)
 		"area-handler", ah,
 		NULL));
 }
+
+void areaUpdateScroll(GtkWidget *area)
+{
+	updateScroll(areaWidget(area));
+}
diff --git a/gtkarea/area.h b/gtkarea/area.h
index 65d26174..9c625fbb 100644
--- a/gtkarea/area.h
+++ b/gtkarea/area.h
@@ -30,3 +30,4 @@ extern GType areaWidget_get_type(void);
 #include "ui.h"
 
 extern GtkWidget *newArea(uiAreaHandler *ah);
+extern void areaUpdateScroll(GtkWidget *area);
diff --git a/gtkarea/main.c b/gtkarea/main.c
index 01edc271..d433577d 100644
--- a/gtkarea/main.c
+++ b/gtkarea/main.c
@@ -7,6 +7,7 @@ struct handler {
 	uiAreaHandler ah;
 };
 
+static GtkWidget *area;
 static struct handler h;
 static GtkWidget *nhspinb;
 static GtkWidget *pphspinb;
@@ -27,7 +28,7 @@ static void handlerVScrollConfig(uiAreaHandler *a, uiArea *area, uintmax_t *n, u
 
 static void recalcScroll(GtkSpinButton *sb, gpointer data)
 {
-	// TODO
+	areaUpdateScroll(area);
 }
 
 static GtkWidget *makeSpinbox(int min)
@@ -45,7 +46,6 @@ int main(void)
 	GtkWidget *mainwin;
 	GtkWidget *box;
 	GtkWidget *scroller;
-	GtkWidget *area;
 	GtkWidget *grid;
 
 	h.ah.HScrollConfig = handlerHScrollConfig;