docs: updated readme

README.md

@@ -3,22 +3,24 @@
 ## Purpose
 
 This is a simple Rust library and binary for converting .FIT files to .GPX files.
-A ***faster*** alternative to [fit2gpx](https://github.com/dodo-saba/fit2gpx)
+A **_faster_** alternative to [fit2gpx](https://github.com/dodo-saba/fit2gpx)
 
 -   [FIT](https://developer.garmin.com/fit/overview/) is a GIS data file format used by Garmin GPS sport devices and Garmin software
 -   [GPX](https://docs.fileformat.com/gis/gpx/) is an XML based format for GPS tracks.
 
 ## Why another one
 
--   cause it's about 80 times as fast
--   cause it's fun
+-   it's about 80 times as fast (single file, no elevation added)
+-   it can add elevation data (though it isn't very precise)
+-   it's fun
 
 ## Why not this one
 
 -   it doesn't support strava bulk-export stuff
 
 ## Direct dependencies
 
+-   [coordinate-altitude](https://github.com/jeromeschmied/coordinate-altitude)
 -   [fit_file](https://crates.io/crates/fit_file)
 -   [gpx](https://crates.io/crates/gpx)
 -   [clap](https://crates.io/crates/clap)