diff --git a/README.md b/README.md
index 6206261..f46e239 100644
--- a/README.md
+++ b/README.md
@@ -295,14 +295,18 @@ This file shows the file(s) containing the subtitles data.
 
 The actual build of the video file is handled by [ffmpeg](https://ffmpeg.org/). The script expects [ffmpeg](https://ffmpeg.org/) to be installed in the environement and will call it as a subprocess.
 
-##### Why not use FFMPEG direcly with the _version index_ URL ?
+#### Why not use FFMPEG direcly with the _version index_ URL ?
 
 So we can select the video resolution and not rely on stream mapping arguments in `ffmpeg`.
 
-##### Why not use VTT subtitles direcly ?
+#### Why not use VTT subtitles direcly ?
 
 Because it fails 😒.
 
+#### Why not use FFMPEG direcly with the _video_ and _audio_ _index_ URL ?
+
+Because some programs would randomly fail 😒. Probably due to invalid _chunking_ on the server.
+
 
 ### 📌 Dependences