improve docs

Author: neverRare

README.md

@@ -16,7 +16,7 @@ deno task build
 
 ## Watching
 
-This builds `./main.js` as a non-minified file with source mapping, intended for testing and debugging. This command also watches the source codes in `./src/` path and rebuilds `./main.js`.
+This builds `./main.js` as a non-minified file with source mapping, intended for testing and debugging. This command also watches the source codes in `./src/` path and rebuilds `./main.js` whenever there are changes.
 
 You'll need [Deno](https://deno.com/). Run the following command.