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diff --git a/guide/hausner/overview.org b/guide/hausner/overview.org
index f41443c..cffaade 100644
--- a/guide/hausner/overview.org
+++ b/guide/hausner/overview.org
@@ -10,37 +10,37 @@
 
   all software used in this robot is available for you to use for any
   purpose, improve, and, share those improvements (if you want).
-** arduino
-*** summary
-    control how the robot gets information from sensors, and moves
-    its motors.
-*** download
-    https://www.arduino.cc/en/Main/Software
-** openscad
-*** summary
-    create robot parts!
-
-    use this program to view parts inside the "3d-printables"
-    directory.  write code to modify the parts and create completely
-    new ones.
-*** download
-    http://www.openscad.org/downloads.html
-** fritzing
-*** summary
-    wire up components!
-*** download
-    http://fritzing.org/download/?donation=0
-** 7-zip
-*** summary
-    extract the contents of .tgz files, like the content of this class.
-
-    this is needed on MS Windows(tm) only.
-
-    if you are on Mac OS X, or GNU (on cygwin or linux), then you do
-    not need this.  your software will be able to extract the
-    class content
-*** download
-    http://7-zip.org/
+** robot behavior: arduino
+   control how the robot gets information from sensors, and moves
+   its motors.
+
+   https://www.arduino.cc/en/Main/Software
+** 3d modeling: openscad
+   create robot parts!
+
+   use this program to view parts inside the "3d-printables"
+   directory.  write code to modify the parts and create completely
+   new ones.
+
+   http://www.openscad.org/downloads.html
+** wiring: fritzing
+   wire up components!
+
+   you can also create your own circuit board layouts and get your
+   design fabricated by fritzing.
+
+   http://fritzing.org/download/?donation=0
+** extract: 7-zip
+   extract the contents of .tgz files, like the content of this class.
+
+   this is needed on MS Windows(tm) only.
+
+   if you are on Mac OS X, or GNU (on top of cygwin or linux), then you
+   do not need this.
+   operating systems other than MS Windows can extract class content
+   with no extra software.
+
+   http://7-zip.org/
 * class content
   all the source code for the class is available here: