diff --git a/app/src/main/java/com/hippo/ehviewer/ui/FilterActivity.java b/app/src/main/java/com/hippo/ehviewer/ui/FilterActivity.java
index bbec39c51..ec7f70e2a 100644
--- a/app/src/main/java/com/hippo/ehviewer/ui/FilterActivity.java
+++ b/app/src/main/java/com/hippo/ehviewer/ui/FilterActivity.java
@@ -128,7 +128,10 @@ public class FilterActivity extends ToolbarActivity {
     }
 
     private void showTipDialog() {
-
+        new AlertDialog.Builder(this)
+                .setTitle(R.string.filter)
+                .setMessage(R.string.filter_tip)
+                .show();
     }
 
     private void showAddFilterDialog() {
diff --git a/app/src/main/res/values-zh-rCN/strings.xml b/app/src/main/res/values-zh-rCN/strings.xml
index 4b7d2b4b0..822011f2e 100644
--- a/app/src/main/res/values-zh-rCN/strings.xml
+++ b/app/src/main/res/values-zh-rCN/strings.xml
@@ -288,6 +288,7 @@
     <string name="delete_uploader_filter">删除上传者过滤项：%s？</string>
     <string name="delete_tag_filter">删除标签过滤项：%s？</string>
     <string name="delete_filter">删除过滤项：%s？</string>
+    <string name="filter_tip">标题过滤项：排除标题含有该关键字的画廊。\n\n上传者过滤项：排除该上传者上传的画廊。\n\n标签过滤项：排除包含该关键字的画廊，这会使获取画廊列表花费更多时间。</string>
 
     <!-- Gallery Activity -->
     <string name="page_menu_title">第 %d 页</string>
diff --git a/app/src/main/res/values-zh-rHK/strings.xml b/app/src/main/res/values-zh-rHK/strings.xml
index b4e4681a6..2630d4237 100644
--- a/app/src/main/res/values-zh-rHK/strings.xml
+++ b/app/src/main/res/values-zh-rHK/strings.xml
@@ -288,6 +288,7 @@
     <string name="delete_uploader_filter">刪除上傳者過濾項：%s？</string>
     <string name="delete_tag_filter">刪除標籤過濾項：%s？</string>
     <string name="delete_filter">刪除過濾項：%s？</string>
+    <string name="filter_tip">標題過濾項：排除標題含有該關鍵字的畫廊。\n\n上傳者過濾項：排除該上傳者上傳的畫廊。\n\n標籤過濾項：排除包含該關鍵字的畫廊，這會使獲取畫廊列表花費更多時間。</string>
 
     <!-- Gallery Activity -->
     <string name="page_menu_title">第 %d 頁</string>
@@ -371,6 +372,7 @@
     <string name="settings_advanced_dump_logcat_to">已保存日誌至 %s</string>
     <string name="settings_advanced_clear_download_path_cache">清除畫廊下載路徑緩存</string>
     <string name="settings_advanced_clear_download_path_cache_summary">畫廊下載路徑可能出錯了，導致重新下載。清除畫廊下載路徑緩存可能解決這個問題。</string>
+    <string name="settings_advanced_clear_download_path_cache_message">清除畫廊下載路徑緩存？</string>
 
     <string name="settings_about">關於</string>
     <string name="settings_about_author">作者</string>
diff --git a/app/src/main/res/values-zh-rTW/strings.xml b/app/src/main/res/values-zh-rTW/strings.xml
index a2f7ec79d..54a67cbd0 100644
--- a/app/src/main/res/values-zh-rTW/strings.xml
+++ b/app/src/main/res/values-zh-rTW/strings.xml
@@ -288,6 +288,7 @@
     <string name="delete_uploader_filter">刪除上傳者過濾項：%s？</string>
     <string name="delete_tag_filter">刪除標籤過濾項：%s？</string>
     <string name="delete_filter">刪除過濾項：%s？</string>
+    <string name="filter_tip">標題過濾項：排除標題含有該關鍵字的畫廊。\n\n上傳者過濾項：排除該上傳者上傳的畫廊。\n\n標籤過濾項：排除包含該關鍵字的畫廊，這會使獲取畫廊列表花費更多時間。</string>
 
     <!-- Gallery Activity -->
     <string name="page_menu_title">第 %d 頁</string>
@@ -371,6 +372,7 @@
     <string name="settings_advanced_dump_logcat_to">已儲存日誌至 %s</string>
     <string name="settings_advanced_clear_download_path_cache">清除畫廊下載路徑快取</string>
     <string name="settings_advanced_clear_download_path_cache_summary">畫廊下載路徑可能出錯了，導致重新下載。清除畫廊下載路徑快取可能解決這個問題。</string>
+    <string name="settings_advanced_clear_download_path_cache_message">清除畫廊下載路徑快取？</string>
 
     <string name="settings_about">關於</string>
     <string name="settings_about_author">作者</string>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 0a370877f..9fa769486 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -328,6 +328,7 @@
     <string name="tip">Tip</string>
     <string name="add_filter">Add filter</string>
     <string name="filter_text">Filter text</string>
+    <string name="filter_tip">Title Filter: exclude the gallery whose title contains the word.\n\nUploader Filter: exclude the gallery which was uploaded by the uploader.\n\nTag Filter: exclude the gallery which contain the tag, it takes more time to get gallery list.</string>
 
     <!-- Gallery Activity -->
     <string name="page_menu_title">Page %d</string>