diff --git a/rb/assets/user_guide.html.erb b/rb/assets/user_guide.html.erb
index f3e3c82..ac183c9 100644
--- a/rb/assets/user_guide.html.erb
+++ b/rb/assets/user_guide.html.erb
@@ -25,6 +25,9 @@
         max-width: 120ex;
         padding: 1ex;
       }
+      a {
+        text-decoration: none;
+      }
       .code {
         padding-left: 2ex;
       }