added note about zcta under postal codes generator section

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csobier
2016-03-18 14:11:59 -04:00
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# General concepts
# General Concepts
The Data Services API offers geocoding and isoline services on top of the CartoDB SQL API by means of a set of functions. Each one of these functions is oriented to one kind of operation and returns the corresponding geometry (a `polygon` or a `point`), according to the input information.