#17973: fix technical inaccuracy in faq entry (it now passes doctest).
diff --git a/Doc/faq/programming.rst b/Doc/faq/programming.rst
index b351eca..b9ed534 100644
--- a/Doc/faq/programming.rst
+++ b/Doc/faq/programming.rst
@@ -1251,7 +1251,7 @@
Under the covers, what this augmented assignment statement is doing is
approximately this::
- >>> result = a_tuple[0].__iadd__(1)
+ >>> result = a_tuple[0] + 1
>>> a_tuple[0] = result
Traceback (most recent call last):
...
@@ -1274,16 +1274,19 @@
>>> a_tuple[0]
['foo', 'item']
-To see why this happens, you need to know that for lists, ``__iadd__`` is equivalent
-to calling ``extend`` on the list and returning the list. That's why we say
-that for lists, ``+=`` is a "shorthand" for ``list.extend``::
+To see why this happens, you need to know that (a) if an object implements an
+``__iadd__`` magic method, it gets called when the ``+=`` augmented assignment
+is executed, and its return value is what gets used in the assignment statement;
+and (b) for lists, ``__iadd__`` is equivalent to calling ``extend`` on the list
+and returning the list. That's why we say that for lists, ``+=`` is a
+"shorthand" for ``list.extend``::
>>> a_list = []
>>> a_list += [1]
>>> a_list
[1]
-is equivalent to::
+This is equivalent to::
>>> result = a_list.__iadd__([1])
>>> a_list = result