Updated README

README.md

@@ -12,6 +12,9 @@ https://opengeodata.lgl-bw.de/#/(sidenav:product/12)
 
 ## Usage
 
-* Specify desired regions in POLYGONS, as WKT Polygon (https://en.wikipedia.org/wiki/Well-known_text_representation_of_geometry). For example from https://wktmap.com/
+* Specify desired regions in REGIONS:
+    * as WKT Polygon (https://en.wikipedia.org/wiki/Well-known_text_representation_of_geometry). For example from https://wktmap.com/
+    * as a ZipCode (e.g. `"70567"`)
+    * or a list of Zipcodes, separated by a comma (e.g. `"79098,79102"`)
 * Run `download_files_from_LGL_BW.py`.
 * Zip and CityGMLs files should be saved in corresponding subfolders, e.g. "StuttgartCenter.proj"