diff --git a/Doc/library/http.server.rst b/Doc/library/http.server.rst
index 1b00b09bf6da7f..0b954d0bc9de50 100644
--- a/Doc/library/http.server.rst
+++ b/Doc/library/http.server.rst
@@ -164,7 +164,8 @@ provides three different variants:
capabilities for future requests. If set to
``'HTTP/1.1'``, the server will permit HTTP persistent connections;
however, your server *must* then include an accurate ``Content-Length``
- header (using :meth:`send_header`) in all of its responses to clients.
+ header (using :meth:`send_header`) in all of its responses to clients
+ (with a few exceptions, like the ``1xx`` and ``204`` status codes [#]_).
For backwards compatibility, the setting defaults to ``'HTTP/1.0'``.
.. attribute:: MessageClass
@@ -562,3 +563,8 @@ server to send nefarious control codes to your terminal.
.. versionchanged:: 3.12
Control characters are scrubbed in stderr logs.
+
+.. rubric:: Footnotes
+
+.. [#] Read more about the ``Content-Length`` header in the relevant RFC:
+ https://www.rfc-editor.org/rfc/rfc9110#section-8.6
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