#13387: add note about checking the exact type in assertIsInstance doc.
diff --git a/Doc/library/unittest.rst b/Doc/library/unittest.rst
index 16a3a36..3d8a84d 100644
--- a/Doc/library/unittest.rst
+++ b/Doc/library/unittest.rst
@@ -895,6 +895,8 @@
Test that *obj* is (or is not) an instance of *cls* (which can be a
class or a tuple of classes, as supported by :func:`isinstance`).
+ To check for a specific type (without including superclasses) use
+ :func:`assertIs(type(obj), cls) <assertIs>`.
.. versionadded:: 2.7