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-rw-r--r--README.md3
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diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -117,6 +117,9 @@ The script requires the following external programs to be available:
- [pdftk](https://www.pdflabs.com/tools/pdftk-the-pdf-toolkit/)
- [GhostScript](https://www.ghostscript.com/)
- [rMAPI](https://github.com/juruen/rmapi)
+- [pdftoppm](https://linux.die.net/man/1/pdftoppm) Optional, but recommended
+ for speed. Usually part of a [Poppler](https://poppler.freedesktop.org/)
+ installation.
If these scripts are not available on the ``PATH`` variable, you can supply
them with the relevant options to the script. Then, you can install