diff --git a/scrapli_netconf/transport/asyncssh_.py b/scrapli_netconf/transport/asyncssh_.py
index fdb72a4..2f66908 100644
--- a/scrapli_netconf/transport/asyncssh_.py
+++ b/scrapli_netconf/transport/asyncssh_.py
@@ -22,7 +22,7 @@ async def open_netconf(self) -> bytes:
             bytes: bytes output from server captured while opening the connection
 
         Raises:
-            N/A
+            ConnectionNotOpened: if unable to open connection (`ChannelOpenError` from asyncssh)
 
         """
         from asyncssh.misc import ChannelOpenError  # pylint: disable=C0415