diff --git a/pep-3138.txt b/pep-3138.txt
index b5018fc7a72..7246c8ed86a 100644
--- a/pep-3138.txt
+++ b/pep-3138.txt
@@ -103,7 +103,7 @@ Specification
     '\\uXXXX'.
 
   * Convert non-printable characters (Py_UNICODE_ISPRINTABLE() returns
-    0) to 'xXX', '\\uXXXX' or '\\U00xxxxxx'.
+    0) to '\\xXX', '\\uXXXX' or '\\U00xxxxxx'.
 
   * Backslash-escape quote characters (apostrophe, 0x27) and add a
     quote character at the beginning and the end.