diff --git a/ext/socket/lib/socket.rb b/ext/socket/lib/socket.rb
index c96e48e8f0..6196638bd2 100644
--- a/ext/socket/lib/socket.rb
+++ b/ext/socket/lib/socket.rb
@@ -606,7 +606,6 @@ class Socket < BasicSocket
   # _opts_ may have following options:
   #
   # [:connect_timeout] specify the timeout in seconds.
-  # [:resolv_timeout] specify the name resolution timeout in seconds.
   #
   # If a block is given, the block is called with the socket.
   # The value of the block is returned.