Merge pull request #1505 from boone/doc_file_requirement

Document requirement for file command.

Merge pull request #1505 from boone/doc_file_requirement
Document requirement for file command.
69e16358 · Prem Sichanugrist · 25b2b124 · 4cb75edd · 69e16358
Commit 69e16358 authored May 09, 2014 by Prem Sichanugrist
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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
 ------------