diff --git a/README.md b/README.md
index edfe574..3c5781b 100644
--- a/README.md
+++ b/README.md
@@ -171,7 +171,7 @@ For Ubuntu, official recommend mirror lists are here:
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-**-firmware**: Specify drivers for Debian to support old hardwares, if your server location is in mainland China, you can prefer it to mirror of 'University of Science and Technology of China(https://mirrors.ustc.edu.cn/debian-cdimage/)' for downloading more quickly, default mirror is from http://cdimage.debian.org/cdimage/.
+**-firmware**: Specify drivers for Debian to support old hardwares, if your server location is in mainland China, program will switch to mirror of 'University of Science and Technology of China(https://mirrors.ustc.edu.cn/debian-cdimage/)' for downloading more quickly, default mirror is from http://cdimage.debian.org/cdimage/.
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