From 3ae2e33a61f8aebbe6ce16f1030687a6e66dbb72 Mon Sep 17 00:00:00 2001
From: Windson yang <wiwindson@outlook.com>
Date: Fri, 6 Jul 2018 07:09:53 +0800
Subject: [PATCH] classify abs() argument type (GH-8103)

---
 Doc/library/functions.rst | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/Doc/library/functions.rst b/Doc/library/functions.rst
index f5427a4072a..6476cbd65e0 100644
--- a/Doc/library/functions.rst
+++ b/Doc/library/functions.rst
@@ -44,7 +44,8 @@ are always available.  They are listed here in alphabetical order.
 
    Return the absolute value of a number.  The argument may be an
    integer or a floating point number.  If the argument is a complex number, its
-   magnitude is returned.
+   magnitude is returned. If *x* defines :meth:`__abs__`,
+   ``abs(x)`` returns ``x.__abs__()``.
 
 
 .. function:: all(iterable)