Issue #25314: Remove confused statement about const argument
diff --git a/Doc/library/argparse.rst b/Doc/library/argparse.rst
index 181291f..c7b8cb7 100644
--- a/Doc/library/argparse.rst
+++ b/Doc/library/argparse.rst
@@ -675,8 +675,7 @@
     Namespace(foo='1')
 
 * ``'store_const'`` - This stores the value specified by the const_ keyword
-  argument.  (Note that the const_ keyword argument defaults to the rather
-  unhelpful ``None``.)  The ``'store_const'`` action is most commonly used with
+  argument.  The ``'store_const'`` action is most commonly used with
   optional arguments that specify some sort of flag.  For example::
 
     >>> parser = argparse.ArgumentParser()
@@ -878,7 +877,8 @@
   command-line argument following it, the value of ``const`` will be assumed instead.
   See the nargs_ description for examples.
 
-The ``const`` keyword argument defaults to ``None``.
+With the ``'store_const'`` and ``'append_const'`` actions, the ``const``
+keyword argument must be given.  For other actions, is defaults to ``None``.
 
 
 default