- # Here there is a trick: The parallel scan operates with a
- # period of L, so we split the sequence indexing in two axes,
- # the second of size CL, and run the parallel scan using the
- # other alone as the sequence index.
+ # Here there is a trick: Since the stack at time t is computed
+ # by updating that at time t-L, the parallel scan operates
+ # with a period of L. To do so we split the time indexing in
+ # two axes, the second of size CL, and run the parallel scan
+ # using the other alone as the sequence index.