diff --git a/app/src/main/java/io/legado/app/help/CacheManager.kt b/app/src/main/java/io/legado/app/help/CacheManager.kt
index 8a88811f6..eb11ed826 100644
--- a/app/src/main/java/io/legado/app/help/CacheManager.kt
+++ b/app/src/main/java/io/legado/app/help/CacheManager.kt
@@ -5,6 +5,9 @@ import io.legado.app.data.entities.Cache
 
 object CacheManager {
 
+    /**
+     * saveTime 单位为秒
+     */
     @JvmOverloads
     fun put(key: String, value: Any, saveTime: Int = 0) {
         val deadline = if (saveTime == 0) 0 else System.currentTimeMillis() + saveTime * 1000