diff --git a/pages/tech.ffmpeg.md b/pages/tech.ffmpeg.md
index 751558b..f0291d5 100644
--- a/pages/tech.ffmpeg.md
+++ b/pages/tech.ffmpeg.md
@@ -2,3 +2,6 @@
 - https://github.com/juliojsb/human-friendly-ffmpeg
 
 [[inform.ffmpeg]]
+
+
+`for i in *.mp4; do ffmpeg -i "$i" "${i%.*}.wav"; done`
\ No newline at end of file