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Update README.md 

I just thought it wasn't clear how to use `detect` with `fence`.
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Richard Law 2018-05-08 21:28:00 +12:00 committed by GitHub
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@ -226,6 +226,12 @@ The `detect` may be one of the following values.
- `exit` is when an object that **was** previously in the fence has exited the area. - `exit` is when an object that **was** previously in the fence has exited the area.
- `cross` is when an object that **was not** previously in the fence has entered **and** exited the area. - `cross` is when an object that **was not** previously in the fence has entered **and** exited the area.
These can be used when establishing a geofence, to pre-filter responses. For instance, to limit responses to `enter` detections:
```
> nearby fleet fence detect enter point 33.462 -112.268 6000
```
## Object types ## Object types
All object types except for XYZ Tiles and QuadKeys can be stored in a collection. XYZ Tiles and QuadKeys are reserved for the SEARCH keyword only. All object types except for XYZ Tiles and QuadKeys can be stored in a collection. XYZ Tiles and QuadKeys are reserved for the SEARCH keyword only.