diff --git a/src/widgets/gcodeeditorwidget.cpp b/src/widgets/gcodeeditorwidget.cpp
--- a/src/widgets/gcodeeditorwidget.cpp
+++ b/src/widgets/gcodeeditorwidget.cpp
@@ -55,6 +55,16 @@
     urlDoc[doc->url()] = m_editor->documents().count() - 1;
     m_tabwidget->setCurrentIndex(t);
     qDebug() << "LOAD " << doc->url() << "DOC:" << m_editor->documents().count() - 1  << "Tab:" << t << m_tabwidget->widget(t);
+    //connect our new document's modified state changed signal.
+    connect(doc, &KTextEditor::Document::modifiedChanged, [this, t](const KTextEditor::Document * document) {
+        QString currText = m_tabwidget->tabText(t);
+        if (document->isModified()) {
+            currText.append('*');
+        } else if (currText.endsWith('*')) {
+            currText.remove('*');
+        }
+        m_tabwidget->setTabText(t, currText);
+    });
 }
 
 void GCodeEditorWidget::setupInterface(const KTextEditor::View *view)