diff --git a/Doc/library/unittest.rst b/Doc/library/unittest.rst
index 32f66feef2b..990bd4853f6 100644
--- a/Doc/library/unittest.rst
+++ b/Doc/library/unittest.rst
@@ -929,6 +929,8 @@ Test cases
 
       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:: 3.2