diff --git a/docs/source/cheat_sheet_py3.rst b/docs/source/cheat_sheet_py3.rst
index 7ae8eeb59d66..b8e43960fd09 100644
--- a/docs/source/cheat_sheet_py3.rst
+++ b/docs/source/cheat_sheet_py3.rst
@@ -152,6 +152,8 @@ Classes
 
 .. code-block:: python
 
+   from typing import ClassVar
+
    class BankAccount:
        # The "__init__" method doesn't return anything, so it gets return
        # type "None" just like any other method that doesn't return anything