diff --git a/README.md b/README.md
index d5fa3d1..0d14ab8 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,5 @@
 # beisu
 
-倍速mp3
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+倍速mp3
+
+先安装 ffmpeg-4.4.1
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