CONTRIBUTORS

--- a/CONTRIBUTORS	Sun Apr 19 19:46:44 2015 +0200
+++ b/CONTRIBUTORS	Sun Apr 19 21:26:50 2015 +0200
@@ -3,6 +3,10 @@
 who is listed as an author in one of the source files of this Isabelle
 distribution.
 
+Contributions to this Isabelle version
+--------------------------------------
+
+
 Contributions to Isabelle2015
 -----------------------------