diff --git a/docs/guide/CSS.md b/docs/guide/CSS.md
index 7e6ea0f86..9c0332bfc 100644
--- a/docs/guide/CSS.md
+++ b/docs/guide/CSS.md
@@ -280,7 +280,7 @@ Unlike the `id` attribute, a widget's classes can be changed after the widget wa
 - [add_class()][textual.dom.DOMNode.add_class] Adds one or more classes to a widget.
 - [remove_class()][textual.dom.DOMNode.remove_class] Removes class name(s) from a widget.
 - [toggle_class()][textual.dom.DOMNode.toggle_class] Removes a class name if it is present, or adds the name if it's not already present.
-- [has_class()][textual.dom.DOMNode.has_class] Checks if a class(es) is set on a widget.
+- [has_class()][textual.dom.DOMNode.has_class] Checks if one or more classes are set on a widget.
 - [classes][textual.dom.DOMNode.classes] Is a frozen set of the class(es) set on a widget.