--- a/Collection.st	Fri Nov 04 15:56:36 2016 +0100
+++ b/Collection.st	Fri Nov 04 15:58:12 2016 +0100
@@ -712,7 +712,7 @@
 firstOrNil
     "return the first element of the collection.
      If its empty, return nil.
-     (i.e. dont trigger an error as done in #first)"
+     (i.e. don't trigger an error as done in #first)"
 
     ^ self firstIfEmpty:nil