bpo-35566: Add links to annotation glossary term (GH-11291)

diff --git a/Doc/tutorial/controlflow.rst b/Doc/tutorial/controlflow.rst
index 08eaa66..9057345 100644
--- a/Doc/tutorial/controlflow.rst
+++ b/Doc/tutorial/controlflow.rst
@@ -682,10 +682,10 @@
 information about the types used by user-defined functions (see :pep:`3107` and
 :pep:`484` for more information).
 
-Annotations are stored in the :attr:`__annotations__` attribute of the function
-as a dictionary and have no effect on any other part of the function.  Parameter
-annotations are defined by a colon after the parameter name, followed by an
-expression evaluating to the value of the annotation.  Return annotations are
+:term:`Annotations <function annotation>` are stored in the :attr:`__annotations__`
+attribute of the function as a dictionary and have no effect on any other part of the
+function.  Parameter annotations are defined by a colon after the parameter name, followed
+by an expression evaluating to the value of the annotation.  Return annotations are
 defined by a literal ``->``, followed by an expression, between the parameter
 list and the colon denoting the end of the :keyword:`def` statement.  The
 following example has a positional argument, a keyword argument, and the return