diff --git a/src/escpos/printer.py b/src/escpos/printer.py
index f2fbe6e..d8342c0 100644
--- a/src/escpos/printer.py
+++ b/src/escpos/printer.py
@@ -440,9 +440,9 @@ if _CUPSPRINT:
         """Simple CUPS printer connector.
 
         .. note::
-                Requires _pycups_ which in turn needs the cups development library package:
-                - Ubuntu/Debian: _libcups2-dev_
-                - OpenSuse/Fedora: _cups-devel_
+                Requires ``pycups`` which in turn needs the cups development library package:
+                - Ubuntu/Debian: ``libcups2-dev``
+                - OpenSuse/Fedora: ``cups-devel``
         """
 
         def __init__(self, printer_name=None, *args, **kwargs):
diff --git a/tox.ini b/tox.ini
index 97849d0..cfd319d 100644
--- a/tox.ini
+++ b/tox.ini
@@ -34,6 +34,7 @@ deps = sphinx>=3.0.0
        sphinxcontrib-spelling>=7.2.0
        sphinxcontrib.datatemplates
        sphinx_rtd_theme
+       pycups
 commands = sphinx-build -W -b html -d {envtmpdir}/doctrees .  {envtmpdir}/html
 
 [testenv:flake8]