  We prove that the elliptic surface y^2=x^3+2(t^8+14t^4+1)x+4t^2(t^8+6t^4+1)
has geometric Mordell-Weil rank 15. This completes a list of Kuwata, who gave
explicit examples of elliptic K3-surfaces with geometric Mordell-Weil rank
0,1,..., 14, 16, 17,18.
