Many thanks for this - it has solved my problem. I thought I'd tried double-clicking but maybe I wasn't close enough to the existing line. -- View this message in context: http://osgeo-org.1560.x6.nabble.com/Add-a-new-vertex-to-a-polyline-tp5279129p5279147.html Sent from the Quantum GIS - User mailing list archive at Nabble.com.