diff --git a/docs/content/tutorial/step_04.ngdoc b/docs/content/tutorial/step_04.ngdoc
index ed9d02ba..fa8be6ed 100644
--- a/docs/content/tutorial/step_04.ngdoc
+++ b/docs/content/tutorial/step_04.ngdoc
@@ -178,6 +178,8 @@ ordering will default to unordered/natural order.
 * Add an `{{orderProp}}` binding into the `index.html` template to display its current value as
 text.
 
+* Reverse the sort order by adding a `-` symbol before the sorting value: `<option value="-age">Oldest</option>`
+
 # Summary
 
 Now that you have added list sorting and tested the app, go to {@link step_05 step 5} to learn