diff --git a/pep-0277.txt b/pep-0277.txt
index f24202ffd..4a995b0a5 100644
--- a/pep-0277.txt
+++ b/pep-0277.txt
@@ -83,7 +83,7 @@ Restrictions
     type and Py_UNICODE_SIZE to be 4.  As the Windows API does not
     accept 4 byte characters, the features described in this proposal
     will not work in this mode so the implementation falls back to the
-    current 'mbcs' encoding technique. This retriction could be lifted
+    current 'mbcs' encoding technique. This restriction could be lifted
     in the future by performing extra conversions using
     PyUnicode_AsWideChar but for now that would add too much
     complexity for a very rarely used feature.
@@ -92,7 +92,10 @@ Restrictions
 Reference Implementation
 
     An experimental implementation is available from
-    http://scintilla.sourceforge.net/winunichanges.zip
+    [2] http://scintilla.sourceforge.net/winunichanges.zip
+
+    [3] An updated version is available at
+        http://python.org/sf/594001
 
 
 References