diff --git a/docs/en/howto/cms-formfield-help-text.md b/docs/en/howto/cms-formfield-help-text.md
index 37f7c5b23..b8ee1e437 100644
--- a/docs/en/howto/cms-formfield-help-text.md
+++ b/docs/en/howto/cms-formfield-help-text.md
@@ -19,7 +19,7 @@ add a `.cms-description-tooltip` class.
 	:::php
 	TextField::create('MyText', 'My Text Label')
 		->setDescription('More <strong>detailed</strong> help')
-		->addExtraClass('cms-help-tooltip');
+		->addExtraClass('cms-description-tooltip');
 
 Tooltips are only supported
 for native, focusable input elements, which excludes
@@ -27,4 +27,4 @@ more complex fields like `GridField`, `UploadField`
 or `DropdownField` with the chosen.js behaviour applied.
 
 Note: For more advanced help text we recommend using
-[Custom form field templates](/topics/forms#custom-form-field-templates);
\ No newline at end of file
+[Custom form field templates](/topics/forms#custom-form-field-templates);