diff --git a/app/src/main/java/acr/browser/lightning/download/LightningDownloadListener.java b/app/src/main/java/acr/browser/lightning/download/LightningDownloadListener.java
index 28264b2..31ed7cb 100644
--- a/app/src/main/java/acr/browser/lightning/download/LightningDownloadListener.java
+++ b/app/src/main/java/acr/browser/lightning/download/LightningDownloadListener.java
@@ -8,6 +8,7 @@ import android.app.Activity;
 import android.app.Dialog;
 import android.content.DialogInterface;
 import android.support.v7.app.AlertDialog;
+import android.text.format.Formatter;
 import android.util.Log;
 import android.webkit.DownloadListener;
 import android.webkit.URLUtil;
@@ -37,7 +38,7 @@ public class LightningDownloadListener implements DownloadListener {
 
     @Override
     public void onDownloadStart(final String url, final String userAgent,
-                                final String contentDisposition, final String mimetype, long contentLength) {
+                                final String contentDisposition, final String mimetype, final long contentLength) {
         PermissionsManager.getInstance().requestPermissionsIfNecessaryForResult(mActivity,
             new String[]{Manifest.permission.READ_EXTERNAL_STORAGE, Manifest.permission.WRITE_EXTERNAL_STORAGE},
             new PermissionsResultAction() {
@@ -59,8 +60,15 @@ public class LightningDownloadListener implements DownloadListener {
                     };
 
                     AlertDialog.Builder builder = new AlertDialog.Builder(mActivity); // dialog
+                    String downloadSize;
+                    if (contentLength > 0) {
+                        downloadSize = Formatter.formatFileSize(mActivity, contentLength);
+                    } else {
+                        downloadSize = mActivity.getString(R.string.unknown_size);
+                    }
+                    String message = mActivity.getString(R.string.dialog_download, downloadSize);
                     Dialog dialog = builder.setTitle(fileName)
-                        .setMessage(mActivity.getResources().getString(R.string.dialog_download))
+                        .setMessage(message)
                         .setPositiveButton(mActivity.getResources().getString(R.string.action_download),
                             dialogClickListener)
                         .setNegativeButton(mActivity.getResources().getString(R.string.action_cancel),
diff --git a/app/src/main/res/values-ar/strings.xml b/app/src/main/res/values-ar/strings.xml
index 06c5eaa..d865877 100644
--- a/app/src/main/res/values-ar/strings.xml
+++ b/app/src/main/res/values-ar/strings.xml
@@ -45,7 +45,7 @@
     <string name="agent_custom">مخصص</string>
     <string name="title_search_engine">محرك البحث</string>
     <string name="action_ok">حسنا</string>
-    <string name="dialog_download">هل ترغب في تحميل هذا الملف؟</string>
+    <string name="dialog_download">هل ترغب في تحميل هذا الملف؟ (%1$s)</string>
     <string name="action_cancel">إلغاء</string>
     <string name="title_warning">تحذير</string>
     <string name="dialog_adobe_not_installed">لم يتم العثور على مشغل الفلاش يرجى تثبيته من المتجر.</string>
diff --git a/app/src/main/res/values-de/strings.xml b/app/src/main/res/values-de/strings.xml
index 6006ab5..c6cfa01 100644
--- a/app/src/main/res/values-de/strings.xml
+++ b/app/src/main/res/values-de/strings.xml
@@ -69,7 +69,7 @@
     <string name="agent_custom">Andere</string>
     <string name="title_search_engine">Suchmaschine</string>
     <string name="action_ok">Ok</string>
-    <string name="dialog_download">Möchten Sie diese Datei herunterladen?</string>
+    <string name="dialog_download">Möchten Sie diese Datei herunterladen? (%1$s)</string>
     <string name="action_cancel">Abbrechen</string>
     <string name="title_warning">Warnung</string>
     <string name="dialog_adobe_not_installed">Adobe Flash Player wurde nicht erkannt.\nBitte installieren Sie den Flash Player.</string>
diff --git a/app/src/main/res/values-es/strings.xml b/app/src/main/res/values-es/strings.xml
index 569b4dd..2c0dcd2 100644
--- a/app/src/main/res/values-es/strings.xml
+++ b/app/src/main/res/values-es/strings.xml
@@ -51,7 +51,7 @@
     <string name="agent_custom">Personalizado</string>
     <string name="title_search_engine">Motor de búsqueda</string>
     <string name="action_ok">Aceptar</string>
-    <string name="dialog_download">¿Quieres descargar este archivo?</string>
+    <string name="dialog_download">¿Quieres descargar este archivo? (%1$s)</string>
     <string name="action_cancel">Cancelar</string>
     <string name="title_warning">Aviso</string>
     <string name="dialog_adobe_not_installed">No se detecta Adobe Flash Player.\nPor favor, instálalo.</string>
diff --git a/app/src/main/res/values-fr/strings.xml b/app/src/main/res/values-fr/strings.xml
index bc66842..2ca2c67 100644
--- a/app/src/main/res/values-fr/strings.xml
+++ b/app/src/main/res/values-fr/strings.xml
@@ -73,7 +73,7 @@
     <string name="agent_custom">Personnalisé</string>
     <string name="title_search_engine">Moteur de recherche</string>
     <string name="action_ok">OK</string>
-    <string name="dialog_download">Voulez-vous télécharger ce fichier ?</string>
+    <string name="dialog_download">Voulez-vous télécharger ce fichier ? (%1$s)</string>
     <string name="action_cancel">Annuler</string>
     <string name="title_warning">Avertissement</string>
     <string name="dialog_adobe_not_installed">Adobe Flash Player n\'a pas été détecté.\nVeuillez installer Flash Player.</string>
diff --git a/app/src/main/res/values-gr/strings.xml b/app/src/main/res/values-gr/strings.xml
index 8e8e729..42e1d34 100644
--- a/app/src/main/res/values-gr/strings.xml
+++ b/app/src/main/res/values-gr/strings.xml
@@ -53,7 +53,7 @@
     <string name="agent_custom">Συγκεκριμένο</string>
     <string name="title_search_engine">Μηχανή Αναζήτησης</string>
     <string name="action_ok">OK</string>
-    <string name="dialog_download">Θα θέλατε να κατεβάσετε αυτό το αρχείο;</string>
+    <string name="dialog_download">Θα θέλατε να κατεβάσετε αυτό το αρχείο; (%1$s)</string>
     <string name="action_cancel">Ακύρωση</string>
     <string name="title_warning">Προσοχή</string>
     <string name="dialog_adobe_not_installed">Δεν ανιχνεύτηκε ο Adobe Flash Player.\nΠαρακαλώ εγκαταστήστε τον Flash Player.</string>
diff --git a/app/src/main/res/values-hu/strings.xml b/app/src/main/res/values-hu/strings.xml
index 6364554..8a8b90b 100644
--- a/app/src/main/res/values-hu/strings.xml
+++ b/app/src/main/res/values-hu/strings.xml
@@ -69,7 +69,7 @@
     <string name="agent_custom">Egyéni</string>
     <string name="title_search_engine">Keresőmotor</string>
     <string name="action_ok">OK</string>
-    <string name="dialog_download">Le szeretnéd tölteni ezt a fájlt?</string>
+    <string name="dialog_download">Le szeretnéd tölteni ezt a fájlt? (%1$s)</string>
     <string name="action_cancel">Mégse</string>
     <string name="title_warning">Figyelmeztetés</string>
     <string name="dialog_adobe_not_installed">Az Adobe Flash Player nincs észlelve.\nKérjük telepítse a Flash Player-t.</string>
diff --git a/app/src/main/res/values-it/strings.xml b/app/src/main/res/values-it/strings.xml
index 604dcd8..8b6aec8 100644
--- a/app/src/main/res/values-it/strings.xml
+++ b/app/src/main/res/values-it/strings.xml
@@ -72,7 +72,7 @@
     <string name="agent_custom">Personalizzato</string>
     <string name="title_search_engine">Motore di ricerca</string>
     <string name="action_ok">OK</string>
-    <string name="dialog_download">Vuoi scaricarlo?</string>
+    <string name="dialog_download">Vuoi scaricarlo? (%1$s)</string>
     <string name="action_cancel">Annulla</string>
     <string name="title_warning">Attenzione</string>
     <string name="dialog_adobe_not_installed">Adobe Flash Player non è stato trovato.\nSi prega di installarlo.</string>
diff --git a/app/src/main/res/values-ja/strings.xml b/app/src/main/res/values-ja/strings.xml
index a19ef8d..59bca81 100644
--- a/app/src/main/res/values-ja/strings.xml
+++ b/app/src/main/res/values-ja/strings.xml
@@ -69,7 +69,7 @@
     <string name="agent_custom">カスタム</string>
     <string name="title_search_engine">検索エンジン</string>
     <string name="action_ok">OK</string>
-    <string name="dialog_download">このファイルをダウンロードしますか?</string>
+    <string name="dialog_download">このファイルをダウンロードしますか? (%1$s)</string>
     <string name="action_cancel">キャンセル</string>
     <string name="title_warning">警告</string>
     <string name="dialog_adobe_not_installed">Adobe Flash Player が見つかりません\nFlash Player をインストールしてください</string>
diff --git a/app/src/main/res/values-ko/strings.xml b/app/src/main/res/values-ko/strings.xml
index 75d010c..b1c7371 100644
--- a/app/src/main/res/values-ko/strings.xml
+++ b/app/src/main/res/values-ko/strings.xml
@@ -52,7 +52,7 @@
     <string name="agent_custom">임의의 UA</string>
     <string name="title_search_engine">검색 엔진</string>
     <string name="action_ok">확인</string>
-    <string name="dialog_download">파일을 다운로드할까요?</string>
+    <string name="dialog_download">파일을 다운로드할까요? (%1$s)</string>
     <string name="action_cancel">취소</string>
     <string name="title_warning">경고</string>
     <string name="dialog_adobe_not_installed">Adobe Flash Player가 감지되지 않았습니다.\nFlash Player를 설치하세요.</string>
diff --git a/app/src/main/res/values-pl/strings.xml b/app/src/main/res/values-pl/strings.xml
index 3a3c32c..16fc7bc 100644
--- a/app/src/main/res/values-pl/strings.xml
+++ b/app/src/main/res/values-pl/strings.xml
@@ -53,7 +53,7 @@
     <string name="agent_custom">Własny identyfikator</string>
     <string name="title_search_engine">Wyszukiwarka</string>
     <string name="action_ok">OK</string>
-    <string name="dialog_download">Czy chcesz pobrać ten plik?</string>
+    <string name="dialog_download">Czy chcesz pobrać ten plik? (%1$s)</string>
     <string name="action_cancel">Anuluj</string>
     <string name="title_warning">Ostrzeżenie</string>
     <string name="dialog_adobe_not_installed">Adobe Flash Player nie został wykryty.\nProszę go zainstalować.</string>
diff --git a/app/src/main/res/values-pt/strings.xml b/app/src/main/res/values-pt/strings.xml
index 05fb451..ba43569 100644
--- a/app/src/main/res/values-pt/strings.xml
+++ b/app/src/main/res/values-pt/strings.xml
@@ -71,7 +71,7 @@
     <string name="agent_custom">Personalizado</string>
     <string name="title_search_engine">Mecanismo de pesquisa</string>
     <string name="action_ok">OK</string>
-    <string name="dialog_download">Deseja descarregar este ficheiro?</string>
+    <string name="dialog_download">Deseja descarregar este ficheiro? (%1$s)</string>
     <string name="action_cancel">Cancelar</string>
     <string name="title_warning">Aviso</string>
     <string name="dialog_adobe_not_installed">O Adobe Flash Player não foi detetado.\nTem que instalar o Flash Player.</string>
diff --git a/app/src/main/res/values-ru/strings.xml b/app/src/main/res/values-ru/strings.xml
index a4f7915..c55010b 100644
--- a/app/src/main/res/values-ru/strings.xml
+++ b/app/src/main/res/values-ru/strings.xml
@@ -55,7 +55,7 @@
     <string name="agent_custom">Выбрать</string>
     <string name="title_search_engine">Поисковая система</string>
     <string name="action_ok">OK</string>
-    <string name="dialog_download">Загрузить файл?</string>
+    <string name="dialog_download">Загрузить файл? (%1$s)</string>
     <string name="action_cancel">Отмена</string>
     <string name="title_warning">Внимание</string>
     <string name="dialog_adobe_not_installed">"Adobe Flash Player не найден.\nУстановите Flash Player"</string>
diff --git a/app/src/main/res/values-sr/strings.xml b/app/src/main/res/values-sr/strings.xml
index 997be39..7d7e5b1 100644
--- a/app/src/main/res/values-sr/strings.xml
+++ b/app/src/main/res/values-sr/strings.xml
@@ -70,7 +70,7 @@
     <string name="agent_custom">Посебна</string>
     <string name="title_search_engine">Мотор претраге</string>
     <string name="action_ok">У реду</string>
-    <string name="dialog_download">Желите ли да преузмете овај фајл?</string>
+    <string name="dialog_download">Желите ли да преузмете овај фајл? (%1$s)</string>
     <string name="action_cancel">Одустани</string>
     <string name="title_warning">Упозорење</string>
     <string name="dialog_adobe_not_installed">Адобов Флеш није откривен.\nИнсталирајте Флеш Плејер.</string>
diff --git a/app/src/main/res/values-tr/strings.xml b/app/src/main/res/values-tr/strings.xml
index d18fdde..e2d6670 100644
--- a/app/src/main/res/values-tr/strings.xml
+++ b/app/src/main/res/values-tr/strings.xml
@@ -53,7 +53,7 @@
     <string name="agent_custom">Kişisel</string>
     <string name="title_search_engine">Arama Motoru</string>
     <string name="action_ok">Tamam</string>
-    <string name="dialog_download">Bu dosyayı indirmek ister misin?</string>
+    <string name="dialog_download">Bu dosyayı indirmek ister misin? (%1$s)</string>
     <string name="action_cancel">İptal</string>
     <string name="title_warning">Uyarı</string>
     <string name="dialog_adobe_not_installed">Adobe Flash Player bulunamadı.\nLütfen Flash Player yükleyin.</string>
diff --git a/app/src/main/res/values-zh-rCN/strings.xml b/app/src/main/res/values-zh-rCN/strings.xml
index a404db0..af1b7e2 100644
--- a/app/src/main/res/values-zh-rCN/strings.xml
+++ b/app/src/main/res/values-zh-rCN/strings.xml
@@ -52,7 +52,7 @@
     <string name="agent_custom">自定义 UA</string>
     <string name="title_search_engine">搜索引擎</string>
     <string name="action_ok">确认</string>
-    <string name="dialog_download">您是否需要下载此文件？</string>
+    <string name="dialog_download">您是否需要下载此文件？ (%1$s)</string>
     <string name="action_cancel">取消</string>
     <string name="title_warning">警告</string>
     <string name="dialog_adobe_not_installed">"未检测到您的设备中安装了 Adobe Flash Player，请先安装 Adobe  Flash Player 后再启用此选项。"</string>
diff --git a/app/src/main/res/values-zh-rTW/strings.xml b/app/src/main/res/values-zh-rTW/strings.xml
index 7b2c221..3961f2a 100644
--- a/app/src/main/res/values-zh-rTW/strings.xml
+++ b/app/src/main/res/values-zh-rTW/strings.xml
@@ -52,7 +52,7 @@
     <string name="agent_custom">自定義 UA</string>
     <string name="title_search_engine">搜索引擎</string>
     <string name="action_ok">確認</string>
-    <string name="dialog_download">您是否需要下載此檔？</string>
+    <string name="dialog_download">您是否需要下載此檔？ (%1$s)</string>
     <string name="action_cancel">取消</string>
     <string name="title_warning">警告</string>
     <string name="dialog_adobe_not_installed">"未檢測到您的設備中安裝了 Adobe Flash Player，請先安裝 Adobe  Flash Player 後再啟用此選項。"</string>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 6a44749..c2bc60b 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -72,7 +72,8 @@
     <string name="agent_custom">Custom</string>
     <string name="title_search_engine">Search Engine</string>
     <string name="action_ok">OK</string>
-    <string name="dialog_download">Do you want to download this file?</string>
+    <string name="dialog_download">Do you want to download this file? (%1$s)</string>
+    <string name="unknown_size">Unknown Size</string>
     <string name="action_cancel">Cancel</string>
     <string name="title_warning">Warning</string>
     <string name="dialog_adobe_not_installed">Adobe Flash Player was not detected.\nPlease install Flash Player.</string>