diff --git a/rwx/sw/ytdlp/__init__.py b/rwx/sw/ytdlp/__init__.py
index c6bae2b..326d5b1 100644
--- a/rwx/sw/ytdlp/__init__.py
+++ b/rwx/sw/ytdlp/__init__.py
@@ -12,6 +12,11 @@ from rwx.log import stream as log
 URL = "https://youtube.com"
 
 
+# ╭─────────╮
+# │ classes │
+# ╰─────────╯
+
+
 class Cache(Object):
     """YouTube local cache."""
 
@@ -79,7 +84,7 @@ class Video(Object):
         :param d: video info
         :type d: dict
         """
-        self.datetime = datetime.now().strftime("%Y%m%d%H%M%S")
+        self.at = datetime.now().strftime("%Y%m%d%H%M%S")
         self.uid = d["id"]
         self.fulltitle = d["fulltitle"]
         self.duration = d["duration"]
@@ -136,7 +141,7 @@ def download_video(video_id: str | None) -> None:
 # ╰─────────╯
 
 
-def extract(opt: dict[str, Any], url: str) -> dict[str, Any]:
+def extract(url: str) -> dict[str, Any]:
     """Return extracted dict.
 
     :rtype: dict
@@ -159,7 +164,7 @@ def extract_playlist(playlist_id: str) -> dict:
     :type playlist_id: str
     :rtype: dict
     """
-    return extract({}, url_playlist(playlist_id))
+    return extract(url_playlist(playlist_id))
 
 
 def extract_playlists(channel_id: str) -> dict:
@@ -169,7 +174,7 @@ def extract_playlists(channel_id: str) -> dict:
     :type channel_id: str
     :rtype: dict
     """
-    return extract({}, url_playlists(channel_id))
+    return extract(url_playlists(channel_id))
 
 
 def extract_video(video_id: str) -> dict:
@@ -179,7 +184,7 @@ def extract_video(video_id: str) -> dict:
     :type video_id: str
     :rtype: dict
     """
-    return extract({}, url_video(video_id))
+    return extract(url_video(video_id))
 
 
 def extract_videos(channel_id: str) -> dict:
@@ -189,7 +194,7 @@ def extract_videos(channel_id: str) -> dict:
     :type channel_id: str
     :rtype: dict
     """
-    return extract({}, url_videos(channel_id))
+    return extract(url_videos(channel_id))
 
 
 # ╭────────╮