Index: string.c
===================================================================
--- string.c	(revision 29250)
+++ string.c	(working copy)
@@ -1224,14 +1224,14 @@ rb_str_times(VALUE str, VALUE times)
  *
  *  Format---Uses <i>str</i> as a format specification, and returns the result
  *  of applying it to <i>arg</i>. If the format specification contains more than
- *  one substitution, then <i>arg</i> must be an <code>Array</code> containing
- *  the values to be substituted. See <code>Kernel::sprintf</code> for details
- *  of the format string.
+ *  one substitution, then <i>arg</i> must be an <code>Array</code> or <code>Hash</code>
+ *  containing the values to be substituted. See <code>Kernel::sprintf</code> for 
+ *  details of the format string.
  *
- *     "%05d" % 123                              #=> "00123"
- *     "%-5s: %08x" % [ "ID", self.object_id ]   #=> "ID   : 200e14d6"
+ *     "%05d" % 123                             #=> "00123"
+ *     "%-5s: %08x" % [ "ID", self.object_id ]  #=> "ID   : 200e14d6"
+ *     "foo = %{foo}" % { :foo => 'bar' }       #=> "foo = bar"
  */
-
 static VALUE
 rb_str_format_m(VALUE str, VALUE arg)
 {
Index: sprintf.c
===================================================================
--- sprintf.c	(revision 29250)
+++ sprintf.c	(working copy)
@@ -422,13 +422,13 @@ get_hash(volatile VALUE *hash, int argc, const VAL
  *     sprintf("%u", -123)                        #=> "-123"
  *
  *  For more complex formatting, Ruby supports a reference by name.
- *  %<name>s style uses format style, but ${name} style doesn't.
+ *  %<name>s style uses format style, but %{name} style doesn't.
  *
  *  Exapmles:
  *    sprintf("%<foo>d : %<bar>f" % { :foo => 1, :bar => 2 })
  *      #=> 1 : 2.000000
- *    sprintf("%d %{foo}" % { :foo => 'bar' })
- *      # => "%d bar"
+ *    sprintf("%{foo}f" % { :foo => 1 })
+ *      # => "1f"
  */
 
 VALUE