diff --git a/acknowledgements.txt b/acknowledgements.txt
index 655e7f2f4013..a4969134b77b 100644
--- a/acknowledgements.txt
+++ b/acknowledgements.txt
@@ -103,3 +103,6 @@
 2011 Jun 24
      Samuel Le Berrigaud (sleberrigaud@github): Report for GH-248:
             protected BlockJUnit4ClassRunner#rules method removed from 4.8.2
+
+2011 Jul 06
+     Stefan Birkner: Fixed wrong docomentation of ClassRule (github#254).
\ No newline at end of file