Update README.

mbostock · Dec 14, 2016 · aa5e046 · aa5e046
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@@ -40,7 +40,7 @@ In a terminal:
 shp2json example.shp
 ```
 
-For a live example, see [bl.ocks.org/2dd741099154a4da55a7db31fd96a892](http://bl.ocks.org/mbostock/2dd741099154a4da55a7db31fd96a892). See also [ndjson-cli](https://github.com/mbostock/ndjson-cli) for examples of manipulating GeoJSON using newline-delimited JSON streams.
+For a live example, see [bl.ocks.org/2dd741099154a4da55a7db31fd96a892](http://bl.ocks.org/mbostock/2dd741099154a4da55a7db31fd96a892). See also [ndjson-cli](https://github.com/mbostock/ndjson-cli) for examples of manipulating GeoJSON using newline-delimited JSON streams. See [Command-Line Cartography](https://medium.com/@mbostock/command-line-cartography-part-1-897aa8f8ca2c) for a longer introduction.
 
 This parser implementation is based on the [ESRI Shapefile Technical Description](http://www.esri.com/library/whitepapers/pdfs/shapefile.pdf) and [dBASE Table File Format](http://www.digitalpreservation.gov/formats/fdd/fdd000325.shtml). Caveat emptor: this is a work in progress and does not currently support all shapefile geometry types. It only supports dBASE III and has little error checking. Please contribute if you want to help!