diff --git a/include/linux/ktime.h b/include/linux/ktime.h
index 1bd6552cc341..6aca67a569a2 100644
--- a/include/linux/ktime.h
+++ b/include/linux/ktime.h
@@ -10,6 +10,12 @@
  *
  *  Started by: Thomas Gleixner and Ingo Molnar
  *
+ *  Credits:
+ *
+ *  	Roman Zippel provided the ideas and primary code snippets of
+ *  	the ktime_t union and further simplifications of the original
+ *  	code.
+ *
  *  For licencing details see kernel-base/COPYING
  */
 #ifndef _LINUX_KTIME_H
diff --git a/kernel/hrtimer.c b/kernel/hrtimer.c
index efff9496b2fa..2b6e1757aedd 100644
--- a/kernel/hrtimer.c
+++ b/kernel/hrtimer.c
@@ -21,6 +21,12 @@
  *  Credits:
  *	based on kernel/timer.c
  *
+ *	Help, testing, suggestions, bugfixes, improvements were
+ *	provided by:
+ *
+ *	George Anzinger, Andrew Morton, Steven Rostedt, Roman Zippel
+ *	et. al.
+ *
  *  For licencing details see kernel-base/COPYING
  */