diff --git a/README.md b/README.md
index 218561d..e8057cf 100644
--- a/README.md
+++ b/README.md
@@ -101,6 +101,7 @@ while chat.is_alive():
 from pytchat import ReplayChat
 
 def main():
+  #seektime (seconds): start position of chat.
   chat = ReplayChat("ojes5ULOqhc", seektime = 60*30)
   while chat.is_alive():
     data = chat.get()