Acknowledge in paper

[Ismael Diego Nunez-Riboni]

I'm planing to submit soon a paper whose data I analyzed with octave and though 
that an acknowledgement for the software would be a good idea. Before I do it, 
I wanted to check that I do not use the wrong terms. How does this sound? :

"The data has been numerically analyzed and plotted with the free software GNU 
Octave and Gnuplot".

Thanks in advance for the feedback. Cheers, Ismael.