diff --git a/files/en-us/web/css/reference/selectors/universal_selectors/index.md b/files/en-us/web/css/reference/selectors/universal_selectors/index.md
index ef4e20883e53b8b..211a49944cd104c 100644
--- a/files/en-us/web/css/reference/selectors/universal_selectors/index.md
+++ b/files/en-us/web/css/reference/selectors/universal_selectors/index.md
@@ -21,6 +21,12 @@ The universal selector is a special [type selector](/en-US/docs/Web/CSS/Referenc
 - `*|*` - matches all elements
 - `|*` - matches all elements without any declared namespace
 
+> [!NOTE]
+> The universal selector (`*`) matches **elements only**.
+> It does **not** directly match pseudo-elements by itself.
+>
+> To match all {{cssxref("::before")}} pseudo-elements on a page, for example, you would have to use a selector like `*::before`. This works because the `*` matches all elements, and the `::before` pseudo-element is available on all elements.
+
 ## Syntax
 
 ```css