title: Seaborn graphing: Highlighting single data point in jointplot
body: <p>I'm trying to just highlight a single point on a Seaborn jointplot, but I'm coming up a little short. I'm able to plot the point from matplotlib - it's just not showing up in the same chart. What am I doing wrong? Thanks!</p>
  
  <pre><code>import seaborn as sns
  import matplotlib.pyplot as plt
  %matplotlib inline
  import pandas as pd
  
  #make some sample data
  test_x = [i for i in range(10)]
  test_y = [j for j in range(10)]
  
  df = pd.DataFrame({'xs':test_x,
                    'ys':test_y})
  
  #make Seaborn chart
  g = sns.jointplot(x="xs", y="ys", data = df)
  
  
  #sort the table to find the top y value
  df = df.sort_values('ys', ascending = False)
  
  #find coordinates of this point
  highlight_x = df.iloc[0,0]
  highlight_y = df.iloc[0,1]
  
  #this is wrong - I want it to be in the same chart
  plt.scatter(highlight_x, highlight_y, color = 'red')
  
  plt.show()
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/nZBby.png" rel="noreferrer"><img src="https://i.stack.imgur.com/nZBby.png" alt="Output from this code"></a></p>