diff --git a/Doc/library/constants.rst b/Doc/library/constants.rst
index 059a21d..a625b43 100644
--- a/Doc/library/constants.rst
+++ b/Doc/library/constants.rst
@@ -26,9 +26,9 @@
 
 .. data:: NotImplemented
 
-   Special value which can be returned by the "rich comparison" special methods
-   (:meth:`__eq__`, :meth:`__lt__`, and friends), to indicate that the comparison
-   is not implemented with respect to the other type.
+   Special value which should be returned by the special methods
+   (:meth:`__eq__`, :meth:`__lt__`, :meth:`__add__`, etc.) to indicate
+   that the operation is not implemented with respect to the other type.
 
 
 .. data:: Ellipsis