Adds in language about counting trips based on start geography.

Author: wellorder

provider/README.md

@@ -375,7 +375,7 @@ The authenticated reports are monthly, historic flat files that may be pre-gener
 
 Report contents include every combination of special group types, geography IDs, and vehicle types in operation for each month since the provider began operations in the jurisdiction. New files are added monthly in addition to the previous monthly historic files. 
 
-Counts are calculated based the agency's local time zone. Trips are counted based on their start time, i.e. if a trip starts in month A but ends in month B, it will be counted only as part of the report for month A.
+Counts are calculated based the agency's local time zone. Trips are counted based on their start time, i.e. if a trip starts in month A but ends in month B, it will be counted only as part of the report for month A. Similarly, trips are counted based on their start geography, i.e. if a trip starts in geography A and ends in geography B, it will appear in the counts for geography A and not for geography B.
 
 All geography IDs included in the city published [Geography](/geography) API endpoint are included in the report results. In lieu of serving an API, this can alternately be a [flat file](/geography#file-format) created by the city and sent to the provider via link. If there is no `/geography` available, then counts are for the entire agency operating area, and `null` is returned for each Geography ID.