How to create a face when only one vertex is selected? I was watching a video on retopology and saw the uploader extrude a mesh face in a way that I've not seen before.  He's in edit-vertex mode and has a partly completed mesh with an L-shaped bend along its edge.  He then selects the vertex on the inside corner of the L and then appears to click somewhere further out - and this causes an entire face to be created:



YouTube clip:
https://youtu.be/KNjCaizeal0?t=8m29s

I've been reading through the docs, but can't figure out what key I need to press to do this.  Does anyone know how to do this?
Looks like blender has an addon called 'f2' mode.  Enable it, and then you can create this sort of quad just by pressing F.

http://wiki.blender.org/index.php/Extensions:2.6/Py/Scripts/Modeling/F2