Modifying legends.

Hello YinLiLin,
Thank you for the great tool for generating GWAS plots. I was wondering if it is possible to modify the legends in a multi-trait Q-Q plot? I want to include the lambda values along with the trait names in the plot.
Kindly help me with some ideas. I have tried using legend(text("lambda=1.008")), but it does not show any modifications in the plot generated.