diff --git a/stdlib/_csv.pyi b/stdlib/_csv.pyi
index 1dc43780f..4329a875b 100644
--- a/stdlib/_csv.pyi
+++ b/stdlib/_csv.pyi
@@ -1,5 +1,8 @@
 from typing import Any, Iterable, Iterator, List, Protocol, Type, Union
 
+# __version__ is deliberately not defined here or in csv.pyi,
+# as it appears to have been hardcoded at "1.0" for a very long time!
+
 QUOTE_ALL: int
 QUOTE_MINIMAL: int
 QUOTE_NONE: int
diff --git a/stdlib/csv.pyi b/stdlib/csv.pyi
index 0b69cb227..60dc597f0 100644
--- a/stdlib/csv.pyi
+++ b/stdlib/csv.pyi
@@ -25,6 +25,9 @@ if sys.version_info >= (3, 8):
 else:
     from collections import OrderedDict as _DictReadMapping
 
+# __version__ is deliberately not defined here or in _csv.pyi,
+# as it appears to have been hardcoded at "1.0" for a very long time!
+
 _T = TypeVar("_T")
 
 class excel(Dialect):