Document the local mode

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@@ -46,6 +46,20 @@ setting:
   - pdfbook   : creates a searchable PDF from a directory of hOCR
                 and image files
 
+## Local operation
+
+While bookpipeline was built with cloud based operation in mind, there is also
+a local mode that can be used to run OCR jobs from a single computer, with all
+the benefits of preprocessing, choosing the best threshold for each image,
+graph creation, PDF creation, and so on that the pipeline provides.
+
+You can use this by passing the '-c local' flag to the core bookpipeline
+commands. Here is a simple example run:
+
+  booktopipeline -c local MyBook
+  bookpipeline -v -c local           # run until MyBook has finished processing
+  getpipelinebook -c local MyBook
+
 ## Contributions
 
 Any and all comments, bug reports, patches or pull requests would