diff --git a/ChangeLog b/ChangeLog
index 8373d5e77a..6701bcc909 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -5,7 +5,7 @@ Fri Nov 30 21:07:56 2012  NAKAMURA Usaku  <usa@ruby-lang.org>
 
 Fri Nov 30 20:47:44 2012  Koichi Sasada  <ko1@atdot.net>
 
-	* thread.c: TracePoint#self returns invoking/exitting thread object
+	* thread.c: TracePoint#self returns invoking/exiting thread object
 	  at thread_begin/end event.
 
 	* test/ruby/test_settracefunc.rb: fix test.
@@ -51,8 +51,8 @@ Fri Nov 30 18:23:26 2012  Koichi Sasada  <ko1@atdot.net>
 	* thread.c: remove Thread.check_interrupt.
 	  This method is difficult to understand by name.
 
-	* thraed.c: add Thread.async_interrupted?.
-	  This method check any defered async interrupts.
+	* thread.c: add Thread.async_interrupted?.
+	  This method check any deferred async interrupts.
 
 	* test/ruby/test_thread.rb: change tests for above.
 
@@ -235,8 +235,8 @@ Fri Nov 30 07:21:33 2012  Koichi Sasada  <ko1@atdot.net>
 
 	[EXPERIMENTAL: NEED DISCUSS]
 	* vm_trace.c: add events
-	  * :thread_begin - hook at thread beggining.
-	  * :thead_end - hook at thread ending.
+	  * :thread_begin - hook at thread beginning.
+	  * :thread_end - hook at thread ending.
 	  * :b_call - hook at block enter.
 	  * :b_return - hook at block leave.
 	  This change slow down block invocation.