title: How to add geom_point() to autolayer() line?
body: <p>Trying to add geom_points to an autolayer() line ("fitted" in pic), which is a <a href="https://robjhyndman.com/hyndsight/forecast7-ggplot2/" rel="nofollow noreferrer">wrapper</a> part of autoplot() for ggplot2 in Rob Hyndmans forecast package (there's a base autoplot/autolayer in ggplot2 too so same likely applies there).</p>
  
  <p>Problem is (I'm no ggplot2 expert, and autoplot wrapper makes it trickier) the geom_point() applies fine to the main call, but how do I apply similar to the autolayer (fitted values)? </p>
  
  <p>Tried type="b" like normal geom_line() but it's not an object param in autolayer().</p>
  
  <pre><code>require(fpp2)
  
  model.ses &lt;- ets(mdeaths, model="ANN", alpha=0.4)
  model.ses.fc &lt;- forecast(model.ses, h=5)
  
  forecast::autoplot(mdeaths) +
    forecast::autolayer(model.ses.fc$fitted, series="Fitted") + # cannot set to show points, and type="b" not allowed
    geom_point() # this works fine against the main autoplot call
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/73ifp.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/73ifp.png" alt="Fitted line needs points"></a></p>