```r
get_usage("saga:sagawetnessindex")
#>ALGORITHM: Saga wetness index
#>	DEM <ParameterRaster>
#>  ...
#>	SLOPE_TYPE <ParameterSelection>
#>  ...
#>	AREA <OutputRaster>
#>	SLOPE <OutputRaster>
#>	AREA_MOD <OutputRaster>
#>	TWI <OutputRaster>
#> ...
#>SLOPE_TYPE(Type of Slope)
#>	0 - [0] local slope
#>	1 - [1] catchment slope
#> ...
```