add documentation for new extra field

diff --git a/docs/api/Output.md b/docs/api/Output.md
index 75220cf510b1595abbaccd084ab388a0304b813f..a5ec933e0fdabb172c9a198e994bed890aab3f88 100644 (file)
--- a/docs/api/Output.md
+++ b/docs/api/Output.md
@@ -106,8 +106,11 @@ The following feature attributes are implemented:
  * `name` - localised name of the place
  * `housenumber`, `street`, `locality`, `district`, `postcode`, `city`,
    `county`, `state`, `country` -
-   provided when it can be determined from the address
+   provided when it can be determined from the address (only with `addressdetails=1`)
  * `admin` - list of localised names of administrative boundaries (only with `addressdetails=1`)
+ * `extra` - dictionary with additional useful tags like `website` or `maxspeed`
+   (only with `extratags=1`)
+
 
 Use `polygon_geojson` to output the full geometry of the object instead
 of the centroid.