diff --git a/x-pack/legacy/plugins/siem/public/pages/detection_engine/rules/components/step_schedule_rule/schema.tsx b/x-pack/legacy/plugins/siem/public/pages/detection_engine/rules/components/step_schedule_rule/schema.tsx
index 2aae772c73bc0..53b67f9bdc28e 100644
--- a/x-pack/legacy/plugins/siem/public/pages/detection_engine/rules/components/step_schedule_rule/schema.tsx
+++ b/x-pack/legacy/plugins/siem/public/pages/detection_engine/rules/components/step_schedule_rule/schema.tsx
@@ -20,7 +20,7 @@ export const schema: FormSchema = {
     helpText: i18n.translate(
       'xpack.siem.detectionEngine.createRule.stepScheduleRule.fieldIntervalHelpText',
       {
-        defaultMessage: 'Rules run periodically and detect signal within the specified time frame.',
+        defaultMessage: 'Rules run periodically and detect signals within the specified time frame.',
       }
     ),
   },