Document requirement for file command.

4cb75edd · Mike Boone · 41da3a3c · 4cb75edd
Commit 4cb75edd authored Apr 06, 2014 by Mike Boone
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README.md
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@@ -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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