Commit 4cb75edd by Mike Boone

Document requirement for file command.

parent 41da3a3c
......@@ -55,6 +55,9 @@ GhostScript to be installed. On Mac OS X, you can also install that using Homebr
brew install gs
### `file` command
The Unix [`file` command](http://en.wikipedia.org/wiki/File_(command)) is required for content type checking.
Installation
------------
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