diff --git a/ChangeLog b/ChangeLog
index 06f9c6bb17..9acc3ecd36 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Fri Jan 25 22:33:38 2008  Yusuke Endoh  <mame@tsg.ne.jp>
+
+	* math.c: fix comment.  [ruby-dev:33276]
+
 Fri Jan 25 10:31:58 2008  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* */*.bat: set svn:mime-type to text/batch.
diff --git a/math.c b/math.c
index 60dd0b7204..813e38c7e7 100644
--- a/math.c
+++ b/math.c
@@ -136,7 +136,7 @@ math_acos(obj, x)
  *  call-seq:
  *     Math.asin(x)    => float
  *  
- *  Computes the arc sine of <i>x</i>. Returns 0..PI.
+ *  Computes the arc sine of <i>x</i>. Returns -{PI/2} .. {PI/2}.
  */
 
 static VALUE