diff --git a/screenless/bureau/bureau.py b/screenless/bureau/bureau.py
index 3ac9a65..1204533 100644
--- a/screenless/bureau/bureau.py
+++ b/screenless/bureau/bureau.py
@@ -357,6 +357,7 @@ class Bureau(object):
         fontconfig = FontConfiguration()
         fontsdir = os.path.join(self.mdir, "fonts")
         for font in glob.glob(fontsdir + ".otf"):
+            self.log.debug("adding font " + "file://" + font)
             fontconfig.add_font_face("file://" + font,
                                      weasyprint.default_url_fetcher)
         for font in glob.glob(fontsdir + ".ttf"):