diff --git a/Doc/reference/expressions.rst b/Doc/reference/expressions.rst
index 879eba8f586c59..05f62cd38ba9a2 100644
--- a/Doc/reference/expressions.rst
+++ b/Doc/reference/expressions.rst
@@ -384,7 +384,7 @@ coroutine function to be an asynchronous generator. For example::
     def gen():  # defines a generator function
         yield 123
 
-    async def agen(): # defines an asynchronous generator function (PEP 525)
+    async def agen(): # defines an asynchronous generator function
         yield 123
 
 Generator functions are described below, while asynchronous generator
@@ -459,6 +459,10 @@ on the right hand side of an assignment statement.
       The proposal to introduce the :token:`yield_from` syntax, making delegation
       to sub-generators easy.
 
+   :pep:`525` - Asynchronous Generators
+      The proposal that expanded on :pep:`492` by adding generator capabilities to
+      coroutine functions.
+
 .. index:: object: generator
 .. _generator-methods: