4-4 point low approach after wedge

 

With the marked stone in place, the followups after are different from the usual joseki. Black will usually invade at a. If not, then white can easily settle the group by playing b.

Jump out  

This is probably the most common continuation. Sometimes black will play at a instead, and white replies at b. could also be at c or d. is normally considered to be a forcing move, and so black makes no effort to rescue it. However, some aji remains. For example:

aji  

Black can move out this way (black a, white b, black c follow).

Attach under  

White can also attach underneath black's invasion stone. This is one possible continuation (black a, white b follow).