Merge branch 'oibe-issue_24'

Author: julia-stripe

cookbook/Chapter 3 - Which borough has the most noise complaints (or, more selecting data).ipynb

@@ -758,7 +758,12 @@
      "cell_type": "markdown",
      "metadata": {},
      "source": [
-      "This is a big array of `True`s and `False`s, one for each row in our dataframe. When we index our dataframe with this array, we get just the rows where.\n",
+      "This is a big array of `True`s and `False`s, one for each row in our
+      dataframe. When we index our dataframe with this array, we get just the
+      rows where our boolean array evaluated to `True`.  It's important to note
+      that for row filtering by a boolean array the length of our dataframe's
+      index must be the same length as the boolean array used for
+      filtering.\n",
       "\n",
       "You can also combine more than one condition with the `&` operator like this:"
      ]
@@ -1601,4 +1606,4 @@
    "metadata": {}
   }
  ]
-}
+}