diff --git a/src/view/katestatusbar.cpp b/src/view/katestatusbar.cpp
--- a/src/view/katestatusbar.cpp
+++ b/src/view/katestatusbar.cpp
@@ -201,6 +201,7 @@
     connect(m_view, &KTextEditor::View::selectionChanged, this, &KateStatusBar::selectionChanged);
     connect(m_view->document(), &KTextEditor::DocumentPrivate::modifiedChanged, this, &KateStatusBar::modifiedChanged);
     connect(m_view->doc(), &KTextEditor::DocumentPrivate::modifiedOnDisk, this, &KateStatusBar::modifiedChanged);
+    connect(m_view->doc(), &KTextEditor::DocumentPrivate::readWriteChanged, this, &KateStatusBar::modifiedChanged);
     connect(m_view->doc(), &KTextEditor::DocumentPrivate::configChanged, this, &KateStatusBar::documentConfigChanged);
     connect(m_view->document(), &KTextEditor::DocumentPrivate::modeChanged, this, &KateStatusBar::modeChanged);
     connect(m_view, &KTextEditor::ViewPrivate::configChanged, this, &KateStatusBar::configChanged);
@@ -347,35 +348,44 @@
 {
     const bool mod = m_view->doc()->isModified();
     const bool modOnHD = m_view->doc()->isModifiedOnDisc();
+    const bool readOnly = !m_view->doc()->isReadWrite();
 
     /**
      * combine to modified status, update only if changed
      */
-    unsigned int newStatus = (unsigned int)mod | ((unsigned int)modOnHD << 1);
+    unsigned int newStatus = (unsigned int)mod | ((unsigned int)modOnHD << 1) | ((unsigned int)readOnly << 2);
     if (m_modifiedStatus == newStatus)
         return;
 
     m_modifiedStatus = newStatus;
     switch (m_modifiedStatus) {
+    case 0x0:
+        m_modified->setIcon(QIcon::fromTheme(QStringLiteral("text-plain")));
+        m_modified->setWhatsThis(i18n("Meaning of current icon: Document was not modified since it was loaded"));
+        break;
+
     case 0x1:
+    case 0x5:
         m_modified->setIcon(QIcon::fromTheme(QStringLiteral("document-save")));
         m_modified->setWhatsThis(i18n("Meaning of current icon: Document was modified since it was loaded"));
         break;
 
     case 0x2:
+    case 0x6:
         m_modified->setIcon(QIcon::fromTheme(QStringLiteral("dialog-warning")));
         m_modified->setWhatsThis(i18n("Meaning of current icon: Document was modified or deleted by another program"));
         break;
 
     case 0x3:
+    case 0x7:
         m_modified->setIcon(QIcon(KIconUtils::addOverlay(QIcon::fromTheme(QStringLiteral("document-save")),
                                        QIcon(QStringLiteral("emblem-important")), Qt::TopLeftCorner)));
         m_modified->setWhatsThis(QString());
         break;
 
     default:
-        m_modified->setIcon(QIcon::fromTheme(QStringLiteral("text-plain")));
-        m_modified->setWhatsThis(i18n("Meaning of current icon: Document was not modified since it was loaded"));
+        m_modified->setIcon(QIcon::fromTheme(QStringLiteral("lock")));
+        m_modified->setWhatsThis(i18n("Meaning of current icon: Document is in read-only mode"));
         break;
     }
 }