diff --git a/pep-0688.rst b/pep-0688.rst
index 7544f0331..db923ff43 100644
--- a/pep-0688.rst
+++ b/pep-0688.rst
@@ -20,7 +20,8 @@ Motivation
 ==========
 
 The CPython C API provides a versatile mechanism for accessing the
-underlying memory of an object—the buffer protocol from :pep:`3118`.
+underlying memory of an object—the `buffer protocol <https://docs.python.org/3/c-api/buffer.html>`__
+introduced in :pep:`3118`.
 Functions that accept binary data are usually written to handle any
 object implementing the buffer protocol. For example, at the time of writing,
 there are around 130 functions in CPython using the Argument Clinic