--- a/docs/signals.rst	2018-12-14 01:55:12.000000000 +0800
+++ b/docs/signals.rst	2019-02-17 00:56:50.461908330 +0800
@@ -101,7 +101,7 @@
 
 
 timeout parameter
-----------------
+-----------------
 
 The ``timeout`` parameter specifies how long ``waitSignal`` should wait for a
 signal to arrive. If the timeout is ``None``, there won't be any timeout, i.e.