diff --git a/Post-Scarcity-Hardware.md b/Post-Scarcity-Hardware.md
index 604747a..027fecd 100644
--- a/Post-Scarcity-Hardware.md
+++ b/Post-Scarcity-Hardware.md
@@ -31,12 +31,12 @@ Performance doesn't actually improve very much. Consider this function, which is
        just map over cells within a row. That's because it isn't worth starting
        a new thread for each cell, but there may be efficiency gains in
        running rows in parallel."
-      ([world function]
+      (\[world function\]
         (map-world world function nil))
-      ([world function additional-args]
-        (into []
-           (pmap (fn [row]
-                    (into [] (map
+      (\[world function additional-args\]
+        (into \[\]
+           (pmap (fn \[row\]
+                    (into \[\] (map
                              #(apply function
                                      (cons world (cons % additional-args)))
                              row)))