pluralize screws to match surrounding sentences

diff --git a/curriculum/challenge-bot.scm b/curriculum/challenge-bot.scm
index f6b533c54db6284420b365be6d24425b8779b26e..6aabb6ddea07497bd1b84a470e346dcf5d18e708 100644 (file)
--- a/curriculum/challenge-bot.scm
+++ b/curriculum/challenge-bot.scm
@@ -177,7 +177,7 @@
      :title [fastening arduino to deck using #6-32x3/8\" screw]
      (p [the "#6" part of "#6-32x3/8\"" is how big around the bolt is.
              it is related to wire gauge.
-             bigger numbers mean larger screw.
+             bigger numbers mean larger screws.
              smaller numbers means smaller screws.]
         (figure :legend "arduino to deck / #6-32 screw"
                 (image :file