@@ -599,10 +599,10 @@ class DotWindow(Gtk.Window):

             ('Reload', Gtk.STOCK_REFRESH, None, None, "Reload graph", self.on_reload),

             ('Print', Gtk.STOCK_PRINT, None, None,

              "Prints the currently visible part of the graph", self.dotwidget.on_print),

-            ('ZoomIn', Gtk.STOCK_ZOOM_IN, None, None, None, self.dotwidget.on_zoom_in),

-            ('ZoomOut', Gtk.STOCK_ZOOM_OUT, None, None, None, self.dotwidget.on_zoom_out),

-            ('ZoomFit', Gtk.STOCK_ZOOM_FIT, None, None, None, self.dotwidget.on_zoom_fit),

-            ('Zoom100', Gtk.STOCK_ZOOM_100, None, None, None, self.dotwidget.on_zoom_100),

+            ('ZoomIn', Gtk.STOCK_ZOOM_IN, None, None, "Zoom in", self.dotwidget.on_zoom_in),

+            ('ZoomOut', Gtk.STOCK_ZOOM_OUT, None, None, "Zoom out", self.dotwidget.on_zoom_out),

+            ('ZoomFit', Gtk.STOCK_ZOOM_FIT, None, None, "Fit zoom", self.dotwidget.on_zoom_fit),

+            ('Zoom100', Gtk.STOCK_ZOOM_100, None, None, "Reset zoom level", self.dotwidget.on_zoom_100),

             ('FindNext', Gtk.STOCK_GO_FORWARD, 'Next Result', None, 'Move to the next search result', self.on_find_next),

         ))