Add text outside plot area

Question

Sample code

library(ggplot2)
ggplot(mtcars, aes(mpg, cyl, color = vs)) + geom_line()

How if it is possible to add arbitrary text to the x a

Answer 1

You can use tag in ggplot2 (see ?ggplot2::labs) and specify it's position in theme

library(ggplot2)
ggplot(mtcars, aes(mpg, cyl, color = vs)) + 
    geom_line() +
    labs(tag = "arbitrary words") +
    theme(plot.tag.position = c(0.15, 0.02))