Question: Add a row to a matrix?

I have a matrix M which is 3x4.  I need add a fourth row to it.  I've been trying

 

E:=Matrix([ [M], [0,0,0,1] ])

and

E:=Matrix([ [Row(M,1)], [Row(M,2)], [Row(M,3)], [0,0,0,1] ])

But neither of them worked.  How would I do this?

Thanks,
Dave

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