diff --git a/pep-0455.txt b/pep-0455.txt
index 0a2789731..f92596aeb 100644
--- a/pep-0455.txt
+++ b/pep-0455.txt
@@ -170,6 +170,10 @@ rather than a specialized case-insensitive dict variant.  The answer
 is that it's nearly as cheap (code-wise and performance-wise) to provide
 the generic construct, and it can fill more use cases.
 
+Even case-insensitive dicts can actually elicit different transformation
+functions: ``str.lower``, ``str.casefold`` or in some cases ``bytes.lower``
+when working with text encoded in a ASCII-compatible encoding.
+
 Other constructor patterns
 --------------------------