diff --git a/types/artifacts.d.ts b/types/artifacts.d.ts
index 9126d5928b8e..ecfd7786fca4 100644
--- a/types/artifacts.d.ts
+++ b/types/artifacts.d.ts
@@ -191,6 +191,7 @@ declare module Artifacts {
     boundingRect: Rect,
     snippet: string,
     nodeLabel: string,
+    explanation?: string,
   }
 
   interface RuleExecutionError {
diff --git a/types/lhr/lhr.d.ts b/types/lhr/lhr.d.ts
index b2a4aae91e7d..0b1ce1d9406e 100644
--- a/types/lhr/lhr.d.ts
+++ b/types/lhr/lhr.d.ts
@@ -103,6 +103,8 @@ declare module Result {
     score: number|null;
     /** An array of references to all the audit members of this category. */
     auditRefs: AuditRef[];
+    /** An array of all the modes supported by the category. */
+    supportedModes?:  Result.GatherMode[];
   }
 
   interface AuditRef {