--- a/OrderedSet.st	Mon Apr 15 19:34:25 2019 +0200
+++ b/OrderedSet.st	Mon Apr 15 19:34:44 2019 +0200
@@ -140,10 +140,10 @@
     "Created: / 15-04-2019 / 19:14:27 / Stefan Vogel"
 !
 
-atIndex:index ifAbsent:aBlock
+atIndex:index ifAbsent:exceptionalValue
     "return an element at a given index"
 
-    ^ order at:index ifAbsent:aBlock
+    ^ order at:index ifAbsent:exceptionalValue
 
     "Created: / 15-04-2019 / 19:18:01 / Stefan Vogel"
 !