diff --git a/peps/pep-0749.rst b/peps/pep-0749.rst
index 6503ef832f1..9b96a9cf8db 100644
--- a/peps/pep-0749.rst
+++ b/peps/pep-0749.rst
@@ -710,12 +710,14 @@ Signature of ``__annotate__`` functions
 
 However, using ``format`` as a parameter name could lead to collisions
 if an annotation uses a class named ``format``. The parameter should be
-positional-only and have a name that cannot be a legal identifier in order
-to avoid this problem.
-
-The current implementation uses the name ``.format`` with a leading
-dot, but the exact name should be considered an implementation detail
-and cannot be relied upon.
+positional-only and have a name that does not coincide with an
+identifier used by user code. We propose to use the name ``__format__``,
+as names with double underscores are reserved for the Python implementation.
+
+A previous version of this PEP proposed using the name ``.format`` with a
+leading dot. While ``.format`` has the advantage that it cannot collide with any
+identifier, reserved or not, it also prevents ``inspect.signature``
+from creating a signature for annotate functions.
 
 The documentation may still use the name ``format`` for simplicity.