[R] Inserting rows

[Ashta]

Hi all,

I have the data set  df with three varaibles,

x1 x2 x3
1  2   5
2  4   1
5  6   0
1  1   2

I want to insert more rows ( eg, 3 rows with value  filled with zeros)
1  2   5
2  4   1
5  6   6
1  1   2
0  0  0
0  0  0
0  0  0

Can any body help me out?

Thanks