DESeq2: PCA plot

Dear all.
I am trying to use PCA plot from cpm integer on DESeq2 with this command line.

plotPCA(vsd,intgroup="Type")

It's generate PCA plot for me but I need label on the PCA plot so then I have added

plotPCA(vsd,intgroup="Type", label = TRUE)

This command generate an error. Error in .local(object, ...) : unused argument (label = TRUE)

What would be the proper command to label data point in the PCA plot.

Many Thanks

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