diff --git a/CSS-Selector-help.md b/CSS-Selector-help.md
index e0e1e8f..7cd97b1 100644
--- a/CSS-Selector-help.md
+++ b/CSS-Selector-help.md
@@ -45,6 +45,12 @@ filter: `//h3/parent::a//@href`
 //img//@src
 ```
 
+# Select just the first instance of something
+```
+xpath:(//h3[contains(@class, 'PagePromo-title')])[1]
+```
+This selects just the first instance of an h3 that contains the class PagePromo-title
+
 # Select by `data-` source
 
 ```