# How to customize M3U8 headers for live captions **URL:** \ **Category:** Wowza Streaming Engine\ **Created:** [June 8, 2015, 5:19am UTC](https://community.wowza.com/t/how-to-customize-m3u8-headers-for-live-captions/34073 "2015-06-08T05:19:35Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![Michael\_Vitale](https://avatars.discourse-cdn.com/v4/letter/m/8e8cbc/32.png) [@Michael\_Vitale](https://community.wowza.com/u/Michael_Vitale)\ **Post date:** [June 8, 2015, 5:19am UTC](https://community.wowza.com/t/how-to-customize-m3u8-headers-for-live-captions/34073/1 "2015-06-08T05:19:35Z")
I’m using the latest Streaming Engine and need a way to customize M3U8 headers. As a quick example: #EXT-X-MEDIA:TYPE=SUBTITLES,GROUP-ID=“subs”,NAME=“English”,FORCED=NO,AUTOSELECT=YES,URI=“subtitlelist\_leng.m3u8”,LANGUAGE=“eng” I want to update FORCED=NO to FORCED=YES. Is there support for this in 4.1.x? ---
**Author:** ![Michelle\_B](https://sea2.discourse-cdn.com/flex002/user_avatar/community.wowza.com/michelle_b/32/394_2.png) [@Michelle\_B](https://community.wowza.com/u/Michelle_B)\ **Post date:** [July 29, 2015, 4:16pm UTC](https://community.wowza.com/t/how-to-customize-m3u8-headers-for-live-captions/34073/2 "2015-07-29T16:16:40Z")
Hi elcapitan26, You can specify the FORCED attribute to have a value of “YES” by adding it in a SMIL file and using the SMIL file for your streaming. You can check the [article on using WebVTT subtitles for HLS](https://www.wowza.com/docs/how-to-stream-webvtt-subtitles-to-ios-for-closed-captioning#livesmil) for more information on this. Here’s a quick example: ```auto ``` Michelle