title: Inserting comments into jupyter notebook
body: <p>I hope this is not a redundant question, but I was not able to find a proper answer and tutorial. I am currently learning Data Science and therefore use kaggle competition for practice and jupyter notebook to tackle them (as it is visually more appealing to me). Now I stumbled upon an example kernel (see: <a href="http://nbviewer.jupyter.org/github/agconti/kaggle-titanic/blob/master/Titanic.ipynb#Data-Handling" rel="noreferrer">http://nbviewer.jupyter.org/github/agconti/kaggle-titanic/blob/master/Titanic.ipynb#Data-Handling</a>) is using comments, links and illustrations between his codes to give more context.</p>
  
  <p>Is anybody aware of how to write such comments and remarks within jupyter? If so, do you have an online resource where I could learn this?</p>
  
  <p>Thanks a bunch!</p>