Extending time series

I noticed that when one tries to extend a time series (ts) object by a
single period using window() actually two observations (NAs) are
added. See below for an example. Does anyone know the reason for this
behavior and how to avoid it?
Yes:
  end(x) + 1
is not what you expect it to be. You can set equivalently
  end = 4
  end = c(4, 1)
to achieve what you want and you can compute one of those
representations in various ways, e.g., tsp(x)[2] + 1.
Z
Thanks.

FS

x<-ts(c(1,2,3))
x1<- window(x, start(x), end(x) + 1, extend = TRUE)
x1
Time Series:
Start = 1 
End = 5 
Frequency = 1 
[1]  1  2  3 NA NA

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Extending time series

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