diff --git a/cheroot/errors.py b/cheroot/errors.py
index 87548f2da2..e00629f86f 100644
--- a/cheroot/errors.py
+++ b/cheroot/errors.py
@@ -71,7 +71,13 @@ def plat_specific_errors(*errnames):
 * ESHUTDOWN — write on a socket which has been shutdown for writing
 * ECONNRESET — connection is reset by the peer, we received a TCP RST packet
 
-Ref: https://github.com/cherrypy/cheroot/issues/341#issuecomment-735884889
+Refs:
+* https://github.com/cherrypy/cheroot/issues/341#issuecomment-735884889
+* https://bugs.python.org/issue30319
+* https://bugs.python.org/issue30329
+* https://github.com/python/cpython/commit/83a2c28
+* https://github.com/python/cpython/blob/c39b52f/Lib/poplib.py#L297-L302
+* https://docs.microsoft.com/windows/win32/api/winsock/nf-winsock-shutdown
 """
 
 try:  # py3
diff --git a/docs/conf.py b/docs/conf.py
index 323a5ad86f..f4c52e6d0d 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -107,6 +107,10 @@
     # Requires a more liberal 'Accept: ' HTTP request header:
     # Ref: https://github.com/sphinx-doc/sphinx/issues/7247
     r'https://github\.com/cherrypy/cheroot/workflows/[^/]+/badge\.svg',
+
+    # Has an ephemeral anchor (line-range) but actual HTML has separate per-
+    # line anchors.
+    r'https://github.com/python/cpython/blob/c39b52f/Lib/poplib.py#L297-L302',
 ]
 linkcheck_workers = 25