diff --git a/plugins/Autocomplete/plugin.py b/plugins/Autocomplete/plugin.py
index fee90457f..31cbcf8da 100644
--- a/plugins/Autocomplete/plugin.py
+++ b/plugins/Autocomplete/plugin.py
@@ -56,7 +56,9 @@ def _commonPrefix(L):
 def _getAutocompleteResponse(irc, msg, payload):
     """Returns the value of the +draft/autocomplete-response tag for the given
     +draft/autocomplete-request payload."""
-    tokens = callbacks.tokenize(payload, channel=msg.channel, network=irc.network)
+    tokens = callbacks.tokenize(
+        payload, channel=msg.channel, network=irc.network
+    )
     normalized_payload = " ".join(tokens)
 
     candidate_commands = _getCandidates(irc, normalized_payload)
@@ -81,12 +83,16 @@ def _getAutocompleteResponse(irc, msg, payload):
             candidate[len(common_prefix)] for candidate in tokenized_candidates
         }
 
-        commands = [" ".join(common_prefix + [word]) for word in words_after_prefix]
+        commands = [
+            " ".join(common_prefix + [word]) for word in words_after_prefix
+        ]
 
     # strip what the user already typed
     assert all(command.startswith(normalized_payload) for command in commands)
     normalized_payload_length = len(normalized_payload)
-    response_items = [command[normalized_payload_length:] for command in commands]
+    response_items = [
+        command[normalized_payload_length:] for command in commands
+    ]
 
     return "\t".join(sorted(response_items))
 
@@ -103,7 +109,9 @@ def _getCandidates(irc, normalized_payload):
         cb_commands += [plugin_name + " " + command for command in cb_commands]
 
         candidates |= {
-            command for command in cb_commands if command.startswith(normalized_payload)
+            command
+            for command in cb_commands
+            if command.startswith(normalized_payload)
         }
 
     return candidates
diff --git a/plugins/Autocomplete/test.py b/plugins/Autocomplete/test.py
index bb42ff9d0..50796a07d 100644
--- a/plugins/Autocomplete/test.py
+++ b/plugins/Autocomplete/test.py
@@ -41,7 +41,10 @@ class AutocompleteTestCase(PluginTestCase):
         self.irc.feedMsg(
             ircmsgs.IrcMsg(
                 prefix="foo!bar@baz",
-                server_tags={"msgid": "1234", "+draft/autocomplete-request": request},
+                server_tags={
+                    "msgid": "1234",
+                    "+draft/autocomplete-request": request,
+                },
                 command="TAGMSG",
                 args=[self.nick],
             )
@@ -86,7 +89,9 @@ class AutocompleteTestCase(PluginTestCase):
         with conf.supybot.protocols.irc.experimentalExtensions.context(True):
             with conf.supybot.plugins.Autocomplete.enabled.context(True):
                 self._assertAutocompleteResponse("misc t", "ell")
-                self._assertAutocompleteResponse("misc c", "learmores\tompletenick")
+                self._assertAutocompleteResponse(
+                    "misc c", "learmores\tompletenick"
+                )
 
     def testSinglePluginName(self):
         with conf.supybot.protocols.irc.experimentalExtensions.context(True):
@@ -119,7 +124,10 @@ class AutocompleteChannelTestCase(ChannelPluginTestCase):
         self.irc.feedMsg(
             ircmsgs.IrcMsg(
                 prefix="foo!bar@baz",
-                server_tags={"msgid": "1234", "+draft/autocomplete-request": request},
+                server_tags={
+                    "msgid": "1234",
+                    "+draft/autocomplete-request": request,
+                },
                 command="TAGMSG",
                 args=[self.channel],
             )
diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 000000000..599bce622
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,4 @@
+[tool.black]
+line-length = 79
+
+include = 'plugins/(Autocomplete|Fediverse)/.*\.pyi?$'