diff --git a/public/docs/ts/latest/tutorial/toh-pt6.jade b/public/docs/ts/latest/tutorial/toh-pt6.jade
index 2383f0a34e..f761a9f19c 100644
--- a/public/docs/ts/latest/tutorial/toh-pt6.jade
+++ b/public/docs/ts/latest/tutorial/toh-pt6.jade
@@ -348,6 +348,7 @@ block get-heroes-details
 :marked
   Refresh the browser and try the new delete functionality.
 
+#observables
 :marked
   ## !{_Observable}s