diff --git a/ChangeLog b/ChangeLog
index be0eb26b0d..8a60f934f3 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Wed Jan 23 23:54:40 2008  Yusuke Endoh  <mame@tsg.ne.jp>
+
+	* sprintf.c: fix comment.  [ruby-dev:33275]
+	* math.c: fix comment.  [ruby-dev:33276]
+
 Wed Jan 23 22:47:34 2008  Yusuke Endoh  <mame@tsg.ne.jp>
 
 	* test/ruby/test_struct.rb: add tests to achieve over 90% test
diff --git a/math.c b/math.c
index f8d21b1850..332d89916d 100644
--- a/math.c
+++ b/math.c
@@ -128,7 +128,7 @@ math_acos(VALUE obj, VALUE 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
diff --git a/sprintf.c b/sprintf.c
index 3b5d38afa0..e5dd513296 100644
--- a/sprintf.c
+++ b/sprintf.c
@@ -221,12 +221,7 @@ sign_bits(int base, const char *p)
  *        s   | Argument is a string to be substituted. If the format
  *            | sequence contains a precision, at most that many characters
  *            | will be copied.
- *        u   | Treat argument as an unsigned decimal number. Negative integers
- *            | are displayed as a 32 bit two's complement plus one for the
- *            | underlying architecture; that is, 2 ** 32 + n.  However, since
- *            | Ruby has no inherent limit on bits used to represent the
- *            | integer, this value is preceded by two dots (..) in order to
- *            | indicate a infinite number of leading sign bits.
+ *        u   | Identical to `d'.
  *        X   | Convert argument as a hexadecimal number using uppercase
  *            | letters. Negative numbers will be displayed with two
  *            | leading periods (representing an infinite string of
@@ -243,7 +238,7 @@ sign_bits(int base, const char *p)
  *     sprintf("%1$*2$s %2$d %1$s", "hello", 8)   #=> "   hello 8 hello"
  *     sprintf("%1$*2$s %2$d", "hello", -8)       #=> "hello    -8"
  *     sprintf("%+g:% g:%-g", 1.23, 1.23, 1.23)   #=> "+1.23: 1.23:1.23"
- *     sprintf("%u", -123)                        #=> "..4294967173"
+ *     sprintf("%u", -123)                        #=> "-123"
  */
 
 VALUE