diff --git a/ChangeLog b/ChangeLog
index 1d6179623e..c4041c1df8 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+Thu Aug 15 15:49:35 2013  Tanaka Akira  <akr@fsij.org>
+
+	* process.c (rb_clock_gettime): [DOC] FreeBSD 7.1 supports
+	  CLOCK_THREAD_CPUTIME_ID.
+	  http://www.freebsd.org/releases/7.1R/relnotes.html
+
 Thu Aug 15 14:30:23 2013  NAKAMURA Usaku  <usa@ruby-lang.org>
 
 	* include/ruby/win32.h, win32/Makefile.sub, win32/win32.c
diff --git a/process.c b/process.c
index 427a1144ba..7600b53ba6 100644
--- a/process.c
+++ b/process.c
@@ -6654,7 +6654,7 @@ rb_proc_times(VALUE obj)
  *  [CLOCK_REALTIME] SUSv2 to 4, Linux 2.5.63, FreeBSD 3.0, NetBSD 2.0, OpenBSD 2.1
  *  [CLOCK_MONOTONIC] SUSv3 to 4, Linux 2.5.63, FreeBSD 3.0, NetBSD 2.0, OpenBSD 3.4
  *  [CLOCK_PROCESS_CPUTIME_ID] SUSv3 to 4, Linux 2.5.63
- *  [CLOCK_THREAD_CPUTIME_ID] SUSv3 to 4, Linux 2.5.63
+ *  [CLOCK_THREAD_CPUTIME_ID] SUSv3 to 4, Linux 2.5.63, FreeBSD 7.1
  *  [CLOCK_VIRTUAL] FreeBSD 3.0, OpenBSD 2.1
  *  [CLOCK_PROF] FreeBSD 3.0, OpenBSD 2.1
  *  [CLOCK_REALTIME_FAST] FreeBSD 8.1