jitter function when length(x) = 1

Hello,

A quick question relating to the documentation of the jitter function:
http://127.0.0.1:15714/library/base/html/jitter.html

jitter(x, factor = 1, amount = NULL)

"If amount is NULL (default), we set a <- factor * d/5 where d is the smallest difference between adjacent unique (apart from fuzz) x values."

Therefore if length(x) = 1, then d = 0, which means jitter(x) should be equal to x?
Which is not the case, i.e.

x <- 1
jitter(x)

[1] 0.9842914

So how does jitter deals with this situation? Does it assume d = x?

Thanks
IC

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