how-to-use.md

@@ -29,6 +29,8 @@ library(reticulate)
 
 plotmap <- import("mapgenerator.plotting.plotmap")
 
+pm <- plotmap$PlotMap()
+
 pm$plot(option1=value1, ..., optionN=valueN)
 
 pm$aplot(option1=value1, ..., optionN=valueN)