diff --git a/app/src/main/assets/help/webDavHelp.md b/app/src/main/assets/help/webDavHelp.md
index dee978b42..50bbcb13a 100644
--- a/app/src/main/assets/help/webDavHelp.md
+++ b/app/src/main/assets/help/webDavHelp.md
@@ -16,4 +16,8 @@
 ### 自动备份说明
 
 * 设置好备份之后每次退出App会自动进行备份
-* WebDav同一天的备份会覆盖,不同日期的备份不会覆盖
\ No newline at end of file
+* WebDav同一天的备份会覆盖,不同日期的备份不会覆盖
+
+### 手动恢复备份说明
+
+* 从WebDav手动下载备份文件需要解压才能恢复
\ No newline at end of file
diff --git a/app/src/main/java/io/legado/app/ui/config/BackupConfigFragment.kt b/app/src/main/java/io/legado/app/ui/config/BackupConfigFragment.kt
index 505ac1dc1..feddfa9fc 100644
--- a/app/src/main/java/io/legado/app/ui/config/BackupConfigFragment.kt
+++ b/app/src/main/java/io/legado/app/ui/config/BackupConfigFragment.kt
@@ -333,7 +333,7 @@ class BackupConfigFragment : PreferenceFragment(),
             AppLog.put("恢复备份出错WebDavError\n${it.localizedMessage}", it)
             alert {
                 setTitle(R.string.restore)
-                setMessage("WebDavError\n${it.localizedMessage}\n将从本地备份恢复。")
+                setMessage("WebDavError\n${it.localizedMessage}\n将从本地备份恢复。\n从WebDav手动下载备份文件需要解压才能恢复。")
                 okButton {
                     restoreFromLocal()
                 }
diff --git a/app/src/main/java/io/legado/app/utils/JsoupExtensions.kt b/app/src/main/java/io/legado/app/utils/JsoupExtensions.kt
index 0b68555c0..b86ca225d 100644
--- a/app/src/main/java/io/legado/app/utils/JsoupExtensions.kt
+++ b/app/src/main/java/io/legado/app/utils/JsoupExtensions.kt
@@ -45,7 +45,7 @@ fun Element.findNS(tag: String, namespace: HashSet<String>): Elements {
 }
 
 fun Element.findNSPrefix(namespaceURI: String): HashSet<String> {
-    return select("[^xmlns]").map { element ->
+    return select("[^xmlns:]").map { element ->
         element.attributes().filter { it.value == namespaceURI }.map { it.key.substring(6) }
     }.flatten().toHashSet()
 }