diff --git a/custom-words.txt b/custom-words.txt
index 47ad31d82e4f..22589aadac72 100644
--- a/custom-words.txt
+++ b/custom-words.txt
@@ -2835,3 +2835,4 @@ dryruns
 Dryrun
 dryrun
 Precheck
+Ueba
diff --git a/specification/securityinsights/resource-manager/Microsoft.SecurityInsights/preview/2022-12-01-preview/Entities.json b/specification/securityinsights/resource-manager/Microsoft.SecurityInsights/preview/2022-12-01-preview/Entities.json
index ccac92a8a168..a5c68f573a2a 100644
--- a/specification/securityinsights/resource-manager/Microsoft.SecurityInsights/preview/2022-12-01-preview/Entities.json
+++ b/specification/securityinsights/resource-manager/Microsoft.SecurityInsights/preview/2022-12-01-preview/Entities.json
@@ -784,9 +784,7 @@
           "type": "string"
         },
         "additionalData": {
-          "additionalProperties": {
-            "type": "object"
-          },
+          "additionalProperties": true,
           "description": "A bag of custom fields that should be part of the entity and will be presented to the user.",
           "type": "object"
         }