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Small change to improve documentation consistency. (#17)

Damon Kohler 9 年之前
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      docs/source/index.rst

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docs/source/index.rst

@@ -71,6 +71,7 @@ this case ``~/Downloads``, and use ``roslaunch`` to bring up the demo:
 
   .. code-block:: bash
 
+    # Download the example bag.
     wget -P ~/Downloads https://storage.googleapis.com/cartographer-public-data/bags/turtlebot/cartographer_turtlebot_demo.bag
 
     # Launch the 2D LIDAR demo.