diff --git a/Audioconvert.md b/Audioconvert.md
index 9a2abe5..f788a15 100644
--- a/Audioconvert.md
+++ b/Audioconvert.md
@@ -1,4 +1,4 @@
-The following script is able to batch-convert audio files to the `m4a` format.
+The following script is able to batch-convert audio files to the `m4a` format. `ffmpeg` needs to be installed.
 
 ```shell
 #!/usr/bin/env sh