diff --git a/src/wormhole/_dilation/manager.py b/src/wormhole/_dilation/manager.py
index 16553b2..9a12409 100644
--- a/src/wormhole/_dilation/manager.py
+++ b/src/wormhole/_dilation/manager.py
@@ -37,9 +37,11 @@ class UnknownDilationMessageType(Exception):
 class ReceivedHintsTooEarly(Exception):
     pass
 
+
 def make_side():
     return bytes_to_hexstr(os.urandom(6))
 
+
 # new scheme:
 # * both sides send PLEASE as soon as they have an unverified key and
 #    w.dilate has been called,