diff --git a/README.md b/README.md
index cb771cb..08bcc62 100644
--- a/README.md
+++ b/README.md
@@ -38,6 +38,7 @@ Please check ConvertToUTF8.sublime-settings file for details. You should save yo
 * convert_on_save: convert the file's content from UTF-8 to its original (or specific) encoding when it is saved (default: true)
 * convert_on_find: convert the text in Find Results view to UTF-8 (default: false)
 * lazy_reload: save file to a temporary location, and reload it in background when switching to other windows or tabs (default: false)
+* confidence: The minimum confidence rate which the converting will be performed automatic. (default: 0.95)
 
 Usage
 ------------------
diff --git a/README.zh_CN.md b/README.zh_CN.md
index a77e1fa..21a7804 100644
--- a/README.zh_CN.md
+++ b/README.zh_CN.md
@@ -38,6 +38,7 @@
 * convert_on_save：文件保存时是否将其内容转换成原有（或指定）编码（默认为 true）
 * convert_on_find：将 Find Results 窗口里的内容转换成 UTF-8（默认为 false）
 * lazy_reload：将文件保存到临时位置，并在切换窗口或标签时在后台自动重载（默认为 false）
+* confidence：最低可信率，检测时超过这个值将触发自动转换（默认为0.95）
 
 使用说明
 ------------------