Diagonal axis labels in R

I'm dumping a relevant code snippet here because I know I will want to come back to it again:
(found here)

> bp = barplot(data$informativeness[1:len], axes=FALSE, axisnames=FALSE)
> text(bp, par("usr")[3], labels = data$feature[1:len], srt = 45, adj = c(1.1,1.1), xpd = TRUE, cex=.9)
> axis(2)