diff --git a/types/sequelize/v3/index.d.ts b/types/sequelize/v3/index.d.ts
index df9ec2bd18..3abf1b970f 100644
--- a/types/sequelize/v3/index.d.ts
+++ b/types/sequelize/v3/index.d.ts
@@ -1,6 +1,10 @@
-// Type definitions for Sequelize 3.4.1
+// Type definitions for Sequelize 3.30.4
 // Project: http://sequelizejs.com
-// Definitions by: samuelneff <https://github.com/samuelneff>, Peter Harris <https://github.com/codeanimal>, Ivan Drinchev <https://github.com/drinchev>, Nick Mueller <https://github.com/morpheusxaut>
+// Definitions by: samuelneff <https://github.com/samuelneff>
+//                 Peter Harris <https://github.com/codeanimal>
+//                 Ivan Drinchev <https://github.com/drinchev>
+//                 Nick Mueller <https://github.com/morpheusxaut>
+//                 James D. Callahan III <https://github.com/torhal>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 // TypeScript Version: 2.3
 
@@ -3052,7 +3056,8 @@ declare namespace sequelize {
      * typesafety, but there is no way to pass the tests if we just remove it.
      */
     interface WhereOptions {
-        [field: string]: string | number | WhereLogic | WhereOptions | col | and | or | WhereGeometryOptions | Array<string | number> | Object;
+        [field: string]: string | number | WhereLogic | WhereOptions | col | and | or | WhereGeometryOptions | Array<string | number> | object | boolean | null;
+
     }
 
     /**