diff --git a/Doc/c-api/codec.rst b/Doc/c-api/codec.rst
index 08a99245ad6528..35ee048bd5fa9f 100644
--- a/Doc/c-api/codec.rst
+++ b/Doc/c-api/codec.rst
@@ -129,3 +129,13 @@ Registry API for Unicode encoding error handlers
    Replace the unicode encode error with ``\N{...}`` escapes.
 
    .. versionadded:: 3.5
+
+
+Codec utility variables
+-----------------------
+
+.. c:var:: const char *Py_hexdigits
+
+   A string constant containing the lowercase hexadecimal digits: ``"0123456789abcdef"``.
+
+   .. versionadded:: 3.3