diff --git a/README.md b/README.md
index a6d1aa7..7314fa6 100644
--- a/README.md
+++ b/README.md
@@ -2,7 +2,7 @@
 ##### This project is complete for now.
 [![Build Status](https://travis-ci.com/Pierce01/MinecraftLauncher-core.svg?branch=master)](https://travis-ci.com/Pierce01/MinecraftLauncher-core)
 [![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)
-![version](https://img.shields.io/badge/stable_version-3.16.18-blue)
+![version](https://img.shields.io/badge/stable_version-3.16.19-blue)
 ![badge](https://img.shields.io/badge/ncurses-not_supported-purple)
 
 MCLC (Minecraft Launcher Core) is a NodeJS solution for launching modded and vanilla Minecraft without having to download and format everything yourself.
@@ -97,6 +97,7 @@ let opts = {
        directory: '', // where the Minecraft jar and version json are located.
        natives: '', // native directory path.
        assetRoot: '',
+       assetIndex: '',
        libraryRoot: '',
        cwd: '', // working directory of the java process.
        detached: true, // whether or not the client is detached from the parent / launcher.
diff --git a/components/handler.js b/components/handler.js
index faff372..80c302a 100644
--- a/components/handler.js
+++ b/components/handler.js
@@ -599,7 +599,7 @@ class Handler {
       '${user_properties}': this.options.authorization.user_properties,
       '${user_type}': this.options.authorization.meta.type,
       '${version_name}': this.options.version.number,
-      '${assets_index_name}': this.options.version.custom || this.options.version.number,
+      '${assets_index_name}': this.options.overrides.assetIndex || this.options.version.custom || this.options.version.number,
       '${game_directory}': this.options.overrides.gameDirectory || this.options.root,
       '${assets_root}': assetPath,
       '${game_assets}': assetPath,
diff --git a/package.json b/package.json
index bfd5346..9e01f5a 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "minecraft-launcher-core",
-  "version": "3.16.18",
+  "version": "3.16.19",
   "description": "Lightweight module that downloads and runs Minecraft using javascript / NodeJS",
   "main": "index.js",
   "dependencies": {