diff --git a/ajv/index.d.ts b/ajv/index.d.ts
index bf487fd341..94d0055551 100644
--- a/ajv/index.d.ts
+++ b/ajv/index.d.ts
@@ -66,18 +66,20 @@ declare namespace Ajv {
         unicode?: boolean;
         format?: string;
         formats?: any;
+        unknownFormats?: true | string[] | "ignore";
         schemas?: any;
-        missingRefs?: boolean;
+        missingRefs?: true | "ignore" | "fail";
+        extendRefs?: true | "ignore" | "fail";
         loadSchema?(uri: string, callback: (error: Error, body: any) => void): void;
-        removeAdditional?: boolean;
-        useDefaults?: boolean;
-        coerceTypes?: boolean;
+        removeAdditional?: boolean | "all" | "failing";
+        useDefaults?: boolean | "shared";
+        coerceTypes?: boolean | "array";
         async?: any;
         transpile?: string;
         meta?: boolean;
-        validateSchema?: boolean;
+        validateSchema?: boolean | "log";
         addUsedSchema?: boolean;
-        inlineRefs?: boolean;
+        inlineRefs?: boolean | number;
         passContext?: boolean;
         loopRequired?: number;
         ownProperties?: boolean;