diff --git a/types/mongoose/index.d.ts b/types/mongoose/index.d.ts
index 7ac3ee7e41..3cf4e4ca2a 100644
--- a/types/mongoose/index.d.ts
+++ b/types/mongoose/index.d.ts
@@ -694,7 +694,7 @@ declare module "mongoose" {
   }
 
   interface SchemaOptions {
-    /** defaults to null (which means use the connection's autoIndex option) */
+    /** defaults to false (which means use the connection's autoIndex option) */
     autoIndex?: boolean;
     /** defaults to true */
     bufferCommands?: boolean;