Update README.md

README.md

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 # Overview
 
-A cross-platform version of [os.startfile](https://docs.python.org/3/library/os.html#os.startfile) from the standard library. This emulates double-clicking a file or single-clicking a URL in an operating system's UI to open the default program.
+This is a cross-platform version of the [os.startfile](https://docs.python.org/3/library/os.html#os.startfile) function in the Python standard library.
+
+It emulates the following actions in an operating system's UI:
+
+- double-clicking a file 
+- single-clicking a URL
+
+which will open the default program associated with that type.
 
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