How can I add labels in a plot where I've used the function `plot` and `points`?

Question

How can I add labels in a plot where I've used the function plot and points?

I have the following code

    x<-seq(0,1,.01)
    alpha=2
    beta=3
    y<-dbeta(x,alpha,beta)
    plot(x,y,ylim=c(0,5.9))
    n=10
    y1<-dbeta(x,alpha+x,beta+n-x)
    points(x,y1)

And the display is

I would like to indicate with labels this is prior and this is posterior .Also indicating which parameters are being used.

I know how to add labels when you only use plot(x,y,xlab="y axis")

but not when combined with points also this form of labeled would not be that clear in the plot.

The labels not in the usual form as is x and y labels in the plot, but indicating inside the plot, this is the prior and this the posterior.

Could you please help?

Thank you in advance.

Answer 1

By the comment of @Chase,

Using the function text().

Example:

text(x = .2, y = 5, label = "Posterior distribution").