diff --git a/doc/api/config.rst b/doc/api/config.rst
index c5e3691..ab17067 100644
--- a/doc/api/config.rst
+++ b/doc/api/config.rst
@@ -1,5 +1,5 @@
 Config
----------
+------
 Module :py:mod:`escpos.config`
 
 .. automodule:: escpos.config