R – Pandoc insert appendix after bibliography

I'm using the knitr package and pandoc in R to convert a .Rmd file to a PDF. Pandoc is linked to a .bib file and automatically inserts the bibliography at the end of the PDF
The entries in my .bib file look like these, taken from http://johnmacfarlane.net/pandoc/demo/biblio.bib:

@Book{item1,
        author="John Doe",
        title="First Book",
        year="2005",
        address="Cambridge",
        publisher="Cambridge University Press"
  }

@Article{item2,
         author="John Doe",
         title="Article",
         year="2006",
         journal="Journal of Generic Studies",
         volume="6",
         pages="33-34"
}

To build my bibliography, I'm using the following function, taken from: http://quantifyingmemory.blogspot.co.il/2013/02/reproducible-research-with-r-knitr.html

knitsPDF <- function(name) {
  library(knitr)
  knit(paste0(name, ".Rmd"), encoding = "utf-8")
  system(paste0("pandoc -o ", name, ".pdf ", name, ".md --bibliography /Users/.../Desktop/test.bib --csl /Users/.../Desktop/taylor-and-francis-harvard-x.csl"))
}

The contents of my .Rmd file is:

This is some text [@item1]

This is more text [@item2]

# References

And outputted PDF looks like this:

If I try to insert an appendix, the references still print at the end of the document, like this:

How do insert an appendix after the references?