diff --git a/Modules/unicodedata.c b/Modules/unicodedata.c
index 575d836..12bda09 100644
--- a/Modules/unicodedata.c
+++ b/Modules/unicodedata.c
@@ -1,8 +1,8 @@
 /* ------------------------------------------------------------------------
 
-   unicodedata -- Provides access to the Unicode 4.1 data base.
+   unicodedata -- Provides access to the Unicode 5.1 data base.
 
-   Data was extracted from the Unicode 4.1 UnicodeData.txt file.
+   Data was extracted from the Unicode 5.1 UnicodeData.txt file.
 
    Written by Marc-Andre Lemburg (mal@lemburg.com).
    Modified for Python 2.0 by Fredrik Lundh (fredrik@pythonware.com)
@@ -34,6 +34,7 @@
     const unsigned char bidir_changed;
     const unsigned char category_changed;
     const unsigned char decimal_changed;
+    const unsigned char mirrored_changed;
     const int numeric_changed;
 } change_record;
 
@@ -355,6 +356,8 @@
         const change_record *old = get_old_record(self, c);
         if (old->category_changed == 0)
             index = 0; /* unassigned */
+        else if (old->mirrored_changed != 0xFF)
+            index = old->mirrored_changed;
     }
     return PyLong_FromLong(index);
 }
@@ -1179,11 +1182,11 @@
 "This module provides access to the Unicode Character Database which\n\
 defines character properties for all Unicode characters. The data in\n\
 this database is based on the UnicodeData.txt file version\n\
-4.1.0 which is publically available from ftp://ftp.unicode.org/.\n\
+5.1.0 which is publically available from ftp://ftp.unicode.org/.\n\
 \n\
 The module uses the same names and symbols as defined by the\n\
-UnicodeData File Format 4.1.0 (see\n\
-http://www.unicode.org/Public/4.1.0/ucd/UCD.html).");
+UnicodeData File Format 5.1.0 (see\n\
+http://www.unicode.org/Public/5.1.0/ucd/UCD.html).");
 
 
 static struct PyModuleDef unicodedatamodule = {