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diff --git a/bill-of-materials.rkt b/bill-of-materials.rkt
index 4a2754c..e257d87 100755
--- a/bill-of-materials.rkt
+++ b/bill-of-materials.rkt
@@ -71,7 +71,7 @@
               ;; this is the argument for the parameter 'quantity'.
               ;; this is the number of millimeters of orange wire
               ;;  in a single robot kit.
-              ;; there are 2 orange wires, one for each wire.
+              ;; there are 2 orange wires, one for each motor.
               ;; the 120 mm wire reaches to the far side of the
               ;;  motor controller
               (+ 120 90)