Update README.md

Author: Oil3

README.md

@@ -16,7 +16,7 @@ The original free MacOS plugin to play .webm movies in Quicklook Preview.
 **Download** from [Releases](https://github.com/Oil3/Webm-QuickLook-Plug-In/releases/tag/march2025).
 
 Or **try the beta 2.0** that quicklook-plays virtually _all non-natively-supported formats_ such as .mkv .wmv .flv .webm .rm, ... even .nuv.   
-Instant playback even from network volumes, [Direct download Silicon beta](https://github.com/Oil3/Mkv-Quicklook/releases/download/1.32-MKV-cache-flush/QL-every-other-formats-BETA.zip)  
+Instant playback even from network volumes, [Direct download Silicon beta](https://github.com/Oil3/Mkv-Quicklook/releases/download/1.32-MKV-cache-flush/QL-every-other-formats-BETA.zip)  [^1] .
 
 
 ###
@@ -52,6 +52,8 @@ Once the app is launched, the WebM Quicklook extension appears in  `Extensions`
 
 
 ## 
+[^1]: The Silicon beta 2.0 uses code from [FFmpeg](http://ffmpeg.org) licensed under [LGPLv2.1](http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html).   
+