diff --git a/ChangeLog b/ChangeLog
index 994ed22229..e5d8b83d65 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Tue Dec 18 02:35:00 2012  Zachary Scott  <zachary@zacharyscott.net>
+
+	* lib/matrix.rb (#dup): typo in example [ruby-core:50946][Bug #7582]
+
 Mon Dec 17 18:03:34 2012  Charlie Somerville  <charlie@charliesomerville.com>
 
 	* class.c (rewrite_cref_stack, clone_method): rewrite a method's cref
diff --git a/lib/matrix.rb b/lib/matrix.rb
index 3e61157c3f..cf23d4159d 100644
--- a/lib/matrix.rb
+++ b/lib/matrix.rb
@@ -1200,7 +1200,7 @@ class Matrix
   #   l.lower_triangular? # => true
   #   u.upper_triangular? # => true
   #   p.permutation?      # => true
-  #   l * u == a * p      # => true
+  #   l * u == p * a      # => true
   #   a.lup.solve([2, 5]) # => Vector[(1/1), (1/2)]
   #
   def lup