DOC: Add install note re: advanced drivers on conda-forge (#474)

docs/source/install.md

@@ -22,7 +22,15 @@ conda install -c conda-forge pyogrio
 
 This requires compatible versions of `GDAL` and `numpy` from `conda-forge` for
 raw I/O support and `geopandas` and their dependencies for GeoDataFrame
-I/O support.
+I/O support. By default, the `GDAL` package on conda-forge already supports a
+wide range of vector formats. If needed, you can install additional drivers by
+installing the associated
+[conda-forge package](https://gdal.org/en/latest/download.html#conda). The
+following packages are currently available to install extra vector drivers:
+
+- `libgdal-arrow-parquet` ((Geo)Parquet and (Geo)Arrow IPC)
+- `libgdal-pg` (PostgreSQL / PostGIS)
+- `libgdal-xls` (XLS - MS Excel format)
 
 ### PyPI
 
@@ -40,6 +48,11 @@ most likely due to the installation process falling back to installing from the
 source distribution because the available wheels are not compatible with your
 platform.
 
+The binary wheels available on PyPI include the core GDAL drivers (GeoJSON,
+ESRI Shapefile, GPKG, FGB, OpenFileGDB, etc) but do not include more advanced
+drivers such as LIBKML and Spatialite. If you need such drivers, we recommend
+that you use conda-forge to install pyogrio as explained above.
+
 ### Troubleshooting installation errors
 
 If you install GeoPandas or Fiona using `pip`, you may encounter issues related