diff --git a/assets/styles/ansi.sass b/assets/styles/ansi.sass
index a79dc0a6..01a92bad 100644
--- a/assets/styles/ansi.sass
+++ b/assets/styles/ansi.sass
@@ -6,8 +6,8 @@
     font-weight: bold
   .italic
     font-style: italic
-  .underscore
-    // monochrome displays only according to http://ascii-table.com/ansi-escape-sequences.php
+  .underline
+    text-decoration: underline
   .black
     color: $ansi-black
   .black.bold