Adding Nodes to Extremes»
To automatically insert nodes at the extreme points of curves (or extrema), choose the Contour > Nodes at Extremes command. We recommend that virtually all curves have nodes at their extreme points (the only exception would be for very small features, whose position is not important to the imaging of a glyph).
To manually add a node at the extreme point of a curve, ShiftCtrlAlt-click the curve with the Contour tool or Shift-click with the Knife tool.
To batch process several glyphs and have more control, use the Nodes at Extremes action in Contour actions.