diff -r 897fe8fa14b5 Doc/tutorial/classes.rst
--- a/Doc/tutorial/classes.rst	Thu Oct 13 23:00:37 2016 -0700
+++ b/Doc/tutorial/classes.rst	Fri Oct 14 10:59:57 2016 +0200
@@ -798,8 +798,9 @@
 Iterators
 =========
 
-By now you have probably noticed that most container objects can be looped over
-using a :keyword:`for` statement::
+By now you have probably noticed that built-in container objects (ie tuple,
+list, dict, set, string ...) can be looped over using a :keyword:`for`
+statement::s
 
    for element in [1, 2, 3]:
        print(element)
@@ -871,6 +872,7 @@
    s
 
 
+
 .. _tut-generators:
 
 Generators