readme

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diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -89,6 +89,8 @@ CUSTOM_VOICE_INSTRUCT = "Speak naturally and clearly, as if reading a dramatic b
 python audiobook_converter.py --voice-clone --voice-sample path/to/reference.wav
 ```
 
+The reference .wav should be ~10-15 seconds with a minimum of 3 seconds and maximum of 60 seconds. Longer is not better. ~15 seconds is ideal.
+
 Omit `--voice-sample-text` and Whisper will be used automatically to transcribe the reference audio (`faster_whisper` or `whisper`). If no Whisper backend is installed, it falls back to x-vector-only cloning.
 
 To skip automatic transcription explicitly, pass `--no-transcription`. This should be worse, but in my experience may give a preferable flatter tone to certain voices.