clarify arduino placement along deck grid holes

diff --git a/curriculum/challenge-bot.scm b/curriculum/challenge-bot.scm
index 8a15f31974df5e0072691f479c3564810376f2a5..2364250c7785f1185ecba9fa10116fee369ff18b 100644 (file)
--- a/curriculum/challenge-bot.scm
+++ b/curriculum/challenge-bot.scm
@@ -37,8 +37,9 @@
         [here's a closeup]
         (figure :legend "arduino to deck / place arduino closeup"
                 (image :file "arduino-to-deck/4-place-arduino-closeup.png"))
-        [the top edge of the arduino should line up with the underside
-             of the holes closest to the edge of the deck.
+        [the arduino should line up with the holes on the deck.
+             place the arduino's top edge along the underside of the
+             deck's holes closest to the edge of the deck.
              on the arduino, there's a hole on the top left.
              that hole should be mid-way between two of the holes in the
              grid of holes on the deck.