diff --git a/ChangeLog b/ChangeLog
index 6ffd918749..e5d8523d3f 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -15,7 +15,7 @@ Mon Apr  4 23:37:05 2016  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 Mon Apr  4 17:43:45 2016  Koichi Sasada  <ko1@atdot.net>
 
-	* gc.c: change deafult value of
+	* gc.c: change default value of
 	  RUBY_GC_HEAP_FREE_SLOTS_MIN_RATIO 0.3 -> 0.2
 	  RUBY_GC_HEAP_FREE_SLOTS_MAX_RATIO 0.8 -> 0.65
 
@@ -25,7 +25,7 @@ Mon Apr  4 17:43:45 2016  Koichi Sasada  <ko1@atdot.net>
 	  However, generational GC reduced each (minor) GC time and
 	  increase memory locality. So that not so big impact on my
 	  benchmarking results.
-	  (surprizingly, this fix speed up programs on some cases)
+	  (surprisingly, this fix speed up programs on some cases)
 
 	  You can change these values by environment variables
 	  if you feel wrong.