clarify 7-zip only necessary on ms windows

[challenge-bot] / guide / hausner / overview.org

diff --git a/guide/hausner/overview.org b/guide/hausner/overview.org
index 9a1b194fae166a44c93a7a56305ad7d4ef35680a..cffaade75c3b9c2c48e0f364be906f11c0d6fae2 100644 (file)
--- a/guide/hausner/overview.org
+++ b/guide/hausner/overview.org
@@ -10,12 +10,12 @@
 
   all software used in this robot is available for you to use for any
   purpose, improve, and, share those improvements (if you want).
-** arduino
+** robot behavior: arduino
    control how the robot gets information from sensors, and moves
    its motors.
 
    https://www.arduino.cc/en/Main/Software
-** openscad
+** 3d modeling: openscad
    create robot parts!
 
    use this program to view parts inside the "3d-printables"
@@ -23,18 +23,22 @@
    new ones.
 
    http://www.openscad.org/downloads.html
-** fritzing
+** 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
-** 7-zip
+** 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 cygwin or linux), then you do
-   not need this.  your software will be able to extract the
-   class content
+   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