diff --git a/cert_lib/src/lib.rs b/cert_lib/src/lib.rs
index 62ad555..0b212ab 100644
--- a/cert_lib/src/lib.rs
+++ b/cert_lib/src/lib.rs
@@ -80,6 +80,8 @@ fn ensure_path_exists<P: AsRef<Path>>(target_path: P) -> Result<(), io::Error> {
 }
 
 /// 计算用于net-filter中power插件中Equal所使用的值。
+///
+/// - `cert`：用于生成EQUAL值的X509证书
 pub fn calculate_power_euqal_result(cert: X509) -> anyhow::Result<String> {
     let x = BigNum::from_slice(cert.signature().as_slice())?;
     let y = BigNum::from_u32(65537)?;