diff --git a/shell/mainwindow.h b/shell/mainwindow.h
--- a/shell/mainwindow.h
+++ b/shell/mainwindow.h
@@ -98,6 +98,7 @@
 
 private Q_SLOTS:
     void updateCaption();
+    void updateActiveDocumentConnection(IDocument* document);
 
     void updateTabColor(IDocument* doc);
     void updateAllTabColors();
diff --git a/shell/mainwindow.cpp b/shell/mainwindow.cpp
--- a/shell/mainwindow.cpp
+++ b/shell/mainwindow.cpp
@@ -325,8 +325,9 @@
     Core::self()->sessionController()->plugActions();
     d->setupGui();
 
-    //Queued so we process it with some delay, to make sure the rest of the UI has already adapted
+    //Queued so we process it with some delay, to make sure the rest of the UI has already adapted 
     connect(Core::self()->documentController(), &IDocumentController::documentActivated, this, &MainWindow::updateCaption, Qt::QueuedConnection);
+    connect(Core::self()->documentController(), &IDocumentController::documentActivated, this, &MainWindow::updateActiveDocumentConnection, Qt::QueuedConnection);
     connect(Core::self()->documentController(), &IDocumentController::documentClosed, this, &MainWindow::updateCaption, Qt::QueuedConnection);
     connect(Core::self()->documentController(), &IDocumentController::documentUrlChanged, this, &MainWindow::updateCaption, Qt::QueuedConnection);
     connect(Core::self()->sessionController()->activeSession(), &ISession::sessionUpdated, this, &MainWindow::updateCaption);
@@ -357,6 +358,12 @@
     return Sublime::MainWindow::queryClose();
 }
 
+void MainWindow::updateActiveDocumentConnection(IDocument* document)
+{
+    disconnect(d->activeDocumentReadWriteConnection);
+    d->activeDocumentReadWriteConnection = connect(document->textDocument(), &KTextEditor::Document::readWriteChanged, this, &MainWindow::updateCaption);
+}
+
 void MainWindow::updateCaption()
 {
     const auto activeSession = Core::self()->sessionController()->activeSession();
@@ -369,11 +376,13 @@
 
         Sublime::Document* doc = area()->activeView()->document();
         Sublime::UrlDocument* urlDoc = dynamic_cast<Sublime::UrlDocument*>(doc);
+        KTextEditor::Document * kTextDocument = Core::self()->documentController()->activeDocument()->textDocument();
         if(urlDoc)
             title += Core::self()->projectController()->prettyFileName(urlDoc->url(), KDevelop::IProjectController::FormatPlain);
         else
             title += doc->title();
-
+        if(kTextDocument && !kTextDocument->isReadWrite())
+            title += i18n(" (read only)");
         title += QLatin1String(" ]");
     }
 
diff --git a/shell/mainwindow_p.h b/shell/mainwindow_p.h
--- a/shell/mainwindow_p.h
+++ b/shell/mainwindow_p.h
@@ -63,6 +63,7 @@
     ~MainWindowPrivate() override;
 
     QPointer<QWidget> centralPlugin;
+    QMetaObject::Connection activeDocumentReadWriteConnection;
 
     void setupActions();
     void setupGui();