Grammar mistake (?)

It literally says «Operating System system functions.»

Author: u-n-known

1-js/01-getting-started/1-intro/article.md

@@ -63,7 +63,7 @@ JavaScript's abilities in the browser are limited for the sake of the user's saf
 
 Examples of such restrictions include:
 
-- JavaScript on a webpage may not read/write arbitrary files on the hard disk, copy them or execute programs. It has no direct access to OS system functions.
+- JavaScript on a webpage may not read/write arbitrary files on the hard disk, copy them or execute programs. It has no direct access to OS functions.
 
     Modern browsers allow it to work with files, but the access is limited and only provided if the user does certain actions, like "dropping" a file into a browser window or selecting it via an `<input>` tag.