title: Possible to hilight specific text (like user-defined words) in rstudio?
body: <p>With theme option, it's quite convenient to edit on rstudio, especially the highlighted keywords, is it possible to add user-defined keywords? as the number <code>1</code> and <code>function</code>.</p>
  
  <p><a href="https://i.stack.imgur.com/khORZ.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/khORZ.png" alt="enter image description here"></a></p>