diff --git a/ChangeLog b/ChangeLog
index 89978e916e..71e8efa654 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+Sun Mar  4 01:01:25 2007  Akinori MUSHA  <knu@iDaemons.org>
+
+	* lib/set.rb (Set#^, Set#&): Correct documentation.  Those methods
+	  return sets, not arrays; noted by Oliver Frank Wittich <nietz AT
+	  mangabrain.de>.
+
 Sat Mar  3 22:54:33 2007  Minero Aoki  <aamine@loveruby.net>
 
 	* lib/fileutils.rb (touch): last #touch change causes error when
diff --git a/lib/set.rb b/lib/set.rb
index 66ffc898a1..15f5cee7d0 100644
--- a/lib/set.rb
+++ b/lib/set.rb
@@ -281,7 +281,7 @@ class Set
   end
   alias difference -	##
 
-  # Returns a new array containing elements common to the set and the
+  # Returns a new set containing elements common to the set and the
   # given enumerable object.
   def &(enum)
     n = self.class.new
@@ -290,7 +290,7 @@ class Set
   end
   alias intersection &	##
 
-  # Returns a new array containing elements exclusive between the set
+  # Returns a new set containing elements exclusive between the set
   # and the given enumerable object.  (set ^ enum) is equivalent to
   # ((set | enum) - (set & enum)).
   def ^(enum)