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 on the curve with the Contour tool.
To batch process several glyphs and have more control, use the Nodes at Extremes action in Contour actions.