diff --git a/docs/source/_templates/hacks.html b/docs/source/_templates/hacks.html
index 708e2b0..bb8edb7 100644
--- a/docs/source/_templates/hacks.html
+++ b/docs/source/_templates/hacks.html
@@ -27,10 +27,12 @@
     font-weight: 400 !important;
   }
 
-  .si {
+  .si,
+  .s1 {
     font-style: italic !important;
   }
 
+
   /* "Quick Search" should be not be shown for now. */
   div#searchbox h3 {
     display: none;