--- rpl/ChangeLog	2015/02/20 08:00:59	1.219
+++ rpl/ChangeLog	2015/03/25 09:46:03	1.220
@@ -1,3 +1,5 @@
+* Mon Feb 19 2015 BERTRAND Joël <rpl@systella.fr> rpl-4.1.21 (RPL/2)
+- 1 -> Y 'Z' now returns undefined implicit name error.
 * Mon Feb 19 2015 BERTRAND Joël <rpl@systella.fr> rpl-4.1.20 (RPL/2)
 - minor bug is fixed in evaluation(). When analyse() is called from
 evaluation(), RPL/2 always evaluates compiled expression;