diff --git a/pep-0455.txt b/pep-0455.txt
index 813820846..7907c8e8e 100644
--- a/pep-0455.txt
+++ b/pep-0455.txt
@@ -53,7 +53,8 @@ and other dict-like classes in the standard library.  Therefore, this PEP
 won't rehash the semantics of most TransformDict methods.
 
 The transformation function needn't be bijective, it can be strictly
-surjective as in the case-insensitive example::
+surjective as in the case-insensitive example (in other words, different
+keys can lookup the same value)::
 
    >>> d = TransformDict(str.casefold)
    >>> d['SomeKey'] = 5