Plot a point with respect to second axis in an existing plotyy

I have a figure with two curves plotted with plotyy and I want to plot a point over the curve referenced to the second axis but I just can't figure it out. I can easily do it for the curve of the primary axis. Here is my code:

[AX, H1, H2] = plotyy(curva_generador(:,1), curva_generador(:,2), curva_generador(:,1), p_generador(:));

axes(AX(2))
h=plot(Vm(5), Pm(5), 'r.-'); 
%Vm is the x axis values for both plots and Pm is the y axis values            %for the plot in the secondary axis

This just plots something weird

Answer 1

[j_solar]

Ok, so I figured it out:

after plotyy this is the following code:

hold(AX(2), 'on'); plot(AX(2),Vm(5), Pm(5), 'r.-');

This will plot the point with respect to the second axis