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The equation is right?

Hi,
I come across an equation in a book on DSP. I feel it is wrong.


The book says: the accumulator with unit-sample response

n
h(n)= SIGMA(delta(k))
k = - lim

is an IIR system. It is a step function, and equals 1 for n>=0 and 0
for n<0.

I think it should be:

n
h(n)= SIGMA(delta(n-k))
k = lim

but, I am still not sure. What is your opinion? Thanks in advance