diff --git a/it4i_theme/css/theme_extra.css b/it4i_theme/css/theme_extra.css
index 3c12cf41e1c81a935712187c4e4be028e870008a..960dd7439bc3936d1ca9c7ff7c23e81764890f42 100644
--- a/it4i_theme/css/theme_extra.css
+++ b/it4i_theme/css/theme_extra.css
@@ -23,6 +23,7 @@ h3, h4, h5, h6 {
     position: relative;
     font-size: 100%;
     color: #838383;
+    text-decoration: underline
 }
 
 .wy-menu-vertical .subnav a {