sched: add credits for RT balancing improvements

add credits for RT balancing improvements.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/kernel/sched.c b/kernel/sched.c
index 23b9925..55c5217 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -22,6 +22,8 @@
  *              by Peter Williams
  *  2007-05-06  Interactivity improvements to CFS by Mike Galbraith
  *  2007-07-01  Group scheduling enhancements by Srivatsa Vaddagiri
+ *  2007-11-29  RT balancing improvements by Steven Rostedt, Gregory Haskins,
+ *              Thomas Gleixner, Mike Kravetz
  */
 
 #include <linux/mm.h>