How to add columns to cell array

I have this cell array:

cells =

    'a'    'b'    'c'
    'd'    'e'    'f'
    'g'    'h'    'i'

What I want to do is add 2 columns with '-' in them.

cells =

    'a'    'b'    'c'    '-'    '-'
    'd'    'e'    'f'    '-'    '-'
    'g'    'h'    'i'    '-'    '-'

Is it possible to do it dynamically depending on the number of rows?

Answer 1

[Azzi Abdelmalek]

[cells repmat({'-'},3,2)]

[Neville]

Wow it works. Thanks Azzi.