Annotations using Package Gaston

Dear all,
I have the code to plot a graph using Gaston

using Gaston
L=[1 2;3 4]
scatter(L[1:1,1], L[1:1,2],linewidth="3", pointtype="fsquare", plotstyle="linespoints",Axes(key = :off))

How can I do a annotation at right of this point, like this? And If I have a set of points and I want to draw a little string beside It?

(My preference is to use the Gaston package)