diff --git a/docs/detections/api/rules/rules-api-create.asciidoc b/docs/detections/api/rules/rules-api-create.asciidoc
index e9ca5aaae4..86f43ba4fd 100644
--- a/docs/detections/api/rules/rules-api-create.asciidoc
+++ b/docs/detections/api/rules/rules-api-create.asciidoc
@@ -350,7 +350,7 @@ Required when `actions` are used to send notifications.
 
 |investigation_fields |Object a| Specify highlighted fields for personalized alert investigation flows:
 
-* `field_names`: String, required
+* `field_names`: String[] , required
 
 |==============================================