diff -Nru sphinx-paramlinks-0.5.0/debian/changelog sphinx-paramlinks-0.5.1/debian/changelog
--- sphinx-paramlinks-0.5.0/debian/changelog	2021-02-04 17:15:34.000000000 +0000
+++ sphinx-paramlinks-0.5.1/debian/changelog	2021-05-15 17:16:32.000000000 +0000
@@ -1,3 +1,9 @@
+sphinx-paramlinks (0.5.1-1) experimental; urgency=medium
+
+  * New upstream release.
+
+ -- Dmitry Shachnev <mitya57@debian.org>  Sat, 15 May 2021 20:16:32 +0300
+
 sphinx-paramlinks (0.5.0-1) unstable; urgency=medium
 
   * New upstream release.
diff -Nru sphinx-paramlinks-0.5.0/PKG-INFO sphinx-paramlinks-0.5.1/PKG-INFO
--- sphinx-paramlinks-0.5.0/PKG-INFO	2021-01-29 18:39:49.006512400 +0000
+++ sphinx-paramlinks-0.5.1/PKG-INFO	2021-05-10 01:28:42.689647400 +0000
@@ -1,6 +1,6 @@
 Metadata-Version: 1.1
 Name: sphinx-paramlinks
-Version: 0.5.0
+Version: 0.5.1
 Summary: Allows param links in Sphinx function/method descriptions to be linkable
 Home-page: http://github.com/sqlalchemyorg/sphinx-paramlinks
 Author: Mike Bayer
@@ -13,7 +13,7 @@
         A `Sphinx <http://sphinx.pocoo.org/>`_ extension which allows ``:param:``
         directives within Python documentation to be linkable.
         
-        This is an experimental, possibly-not-useful extension that's used by the
+        This is an experimental extension that's used by the
         `SQLAlchemy <http://www.sqlalchemy.org>`_ project and related projects.
         
         Configuration
diff -Nru sphinx-paramlinks-0.5.0/README.rst sphinx-paramlinks-0.5.1/README.rst
--- sphinx-paramlinks-0.5.0/README.rst	2021-01-29 17:13:09.000000000 +0000
+++ sphinx-paramlinks-0.5.1/README.rst	2021-02-01 16:02:47.000000000 +0000
@@ -5,7 +5,7 @@
 A `Sphinx <http://sphinx.pocoo.org/>`_ extension which allows ``:param:``
 directives within Python documentation to be linkable.
 
-This is an experimental, possibly-not-useful extension that's used by the
+This is an experimental extension that's used by the
 `SQLAlchemy <http://www.sqlalchemy.org>`_ project and related projects.
 
 Configuration
diff -Nru sphinx-paramlinks-0.5.0/sphinx_paramlinks/__init__.py sphinx-paramlinks-0.5.1/sphinx_paramlinks/__init__.py
--- sphinx-paramlinks-0.5.0/sphinx_paramlinks/__init__.py	2021-01-29 17:01:54.000000000 +0000
+++ sphinx-paramlinks-0.5.1/sphinx_paramlinks/__init__.py	2021-05-10 01:28:05.000000000 +0000
@@ -1,3 +1,3 @@
-__version__ = "0.5.0"
+__version__ = "0.5.1"
 
 from .sphinx_paramlinks import setup  # noqa
diff -Nru sphinx-paramlinks-0.5.0/sphinx_paramlinks/sphinx_paramlinks.py sphinx-paramlinks-0.5.1/sphinx_paramlinks/sphinx_paramlinks.py
--- sphinx-paramlinks-0.5.0/sphinx_paramlinks/sphinx_paramlinks.py	2021-01-29 18:36:04.000000000 +0000
+++ sphinx-paramlinks-0.5.1/sphinx_paramlinks/sphinx_paramlinks.py	2021-05-10 01:24:13.000000000 +0000
@@ -309,7 +309,13 @@
         doc_entries = entries[docname]
         _indexentries(app.env)[docname].extend(doc_entries)
 
-        if LooseVersion(__version__) >= LooseVersion("3.0.0"):
+        if LooseVersion(__version__) >= LooseVersion("4.0.0"):
+            for entry in doc_entries:
+                sing, desc, ref, extra = entry[:4]
+                app.env.domains["py"].data["objects"][ref] = ObjectEntry(
+                    docname, ref, "parameter", False
+                )
+        elif LooseVersion(__version__) >= LooseVersion("3.0.0"):
             for entry in doc_entries:
                 sing, desc, ref, extra = entry[:4]
                 app.env.domains["py"].data["objects"][ref] = ObjectEntry(
diff -Nru sphinx-paramlinks-0.5.0/sphinx_paramlinks.egg-info/PKG-INFO sphinx-paramlinks-0.5.1/sphinx_paramlinks.egg-info/PKG-INFO
--- sphinx-paramlinks-0.5.0/sphinx_paramlinks.egg-info/PKG-INFO	2021-01-29 18:39:48.000000000 +0000
+++ sphinx-paramlinks-0.5.1/sphinx_paramlinks.egg-info/PKG-INFO	2021-05-10 01:28:42.000000000 +0000
@@ -1,6 +1,6 @@
 Metadata-Version: 1.1
 Name: sphinx-paramlinks
-Version: 0.5.0
+Version: 0.5.1
 Summary: Allows param links in Sphinx function/method descriptions to be linkable
 Home-page: http://github.com/sqlalchemyorg/sphinx-paramlinks
 Author: Mike Bayer
@@ -13,7 +13,7 @@
         A `Sphinx <http://sphinx.pocoo.org/>`_ extension which allows ``:param:``
         directives within Python documentation to be linkable.
         
-        This is an experimental, possibly-not-useful extension that's used by the
+        This is an experimental extension that's used by the
         `SQLAlchemy <http://www.sqlalchemy.org>`_ project and related projects.
         
         Configuration