diff --git a/Makefile b/Makefile
index 55a00bd..a18697c 100644
--- a/Makefile
+++ b/Makefile
@@ -14,5 +14,5 @@ test:
 serve-docs:
 	@cd docs;\
 	make html;\
-	cd build/html;\
+	cd _build/html;\
 	python -m http.server;\
diff --git a/docs/hdi/index.md b/docs/hdi/index.md
index 8b5385d..5fe8da3 100644
--- a/docs/hdi/index.md
+++ b/docs/hdi/index.md
@@ -13,4 +13,4 @@ player.md
 filters.md
 queue.md
 events.md
-``
+```
diff --git a/pomice/events.py b/pomice/events.py
index df93cd6..53379e6 100644
--- a/pomice/events.py
+++ b/pomice/events.py
@@ -38,8 +38,6 @@ class PomiceEvent(ABC):
     ```
     """
 
-    __slots__ = ("name", "handler_args")
-
     name = "event"
     handler_args: Tuple
 
diff --git a/pomice/player.py b/pomice/player.py
index 6efdde7..fbc863d 100644
--- a/pomice/player.py
+++ b/pomice/player.py
@@ -122,7 +122,6 @@ class Player(VoiceProtocol):
         "_ending_track",
         "_voice_state",
         "_player_endpoint_uri",
-        "__dict__",
     )
 
     def __call__(self, client: Client, channel: VoiceChannel) -> "Player":