CONTRIBUTORS

--- a/CONTRIBUTORS	Sun Feb 17 20:45:49 2013 +0100
+++ b/CONTRIBUTORS	Sun Feb 17 21:29:30 2013 +0100
@@ -6,10 +6,13 @@
 Contributions to this Isabelle version
 --------------------------------------
 
-* 2013: Florian Haftmann, TUM
+* Feb. 2013: Florian Haftmann, TUM
   Reworking and consolidation of code generation for target
   language numerals.
 
+* Feb. 2013: Florian Haftmann, TUM
+  Sieve of Eratosthenes.
+
 
 Contributions to Isabelle2013
 -----------------------------