R ggplot2: Labelling a horizontal line on the y axis with a numeric value

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It’s not clear if you want 7.1 to be part of the y-axis, or if you just want a way to label the line. Assuming the former, you can use scale_y_continuous() to define your own breaks. Something like this may do what you want (will need some fiddling most likely):

plot1+ geom_hline(aes(yintercept=h)) + 
  scale_y_continuous(breaks = sort(c(seq(min(df$y), max(df$y), length.out=5), h)))

enter image description here

Assuming the latter, this is probably more what you want:

plot1 + geom_hline(aes(yintercept=h)) +
  geom_text(aes(0,h,label = h, vjust = -1))

enter image description here

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