Update 02 Get Universe Data.html

04 Research Environment/05 Universes/02 Get Universe Data.html

@@ -57,6 +57,8 @@
 
     <p class='python'>The <code>universe_history</code> method returns a Series where the multi-index is the universe <code>Symbol</code> and the time when universe selection would occur in a backtest. Each row in the data column contains a list of <code>Fundamental</code> objects. The following image shows the first 5 rows of an example Series:</p>
     <img class="python docs-image" src="https://cdn.quantconnect.com/i/tu/universe-selection-history-dataframe-python.png" alt="Historical fundamental universe dataframe">
+    <p class='python'>To get a flat DataFrame instead of a Series, set the <code>flatten</code> argument to <code>True</code>.</p>
+
     <p class='csharp'>The <code>UniverseHistory</code> method returns an <code>IEnumerable&lt;IEnumerable&lt;Fundamental&gt;&gt;</code> object. </p>
 
     <li class='python'>Iterate through the Series to access the universe data.</li>