diff --git a/fileitemaction/denote_fileitemaction.cpp b/fileitemaction/denote_fileitemaction.cpp
index d0a128f..bb6e34e 100644
--- a/fileitemaction/denote_fileitemaction.cpp
+++ b/fileitemaction/denote_fileitemaction.cpp
@@ -14,6 +14,7 @@
 #include <QFileInfo>
 #include <cstdio>
 #include <QFormLayout>
+#include <QComboBox>
 #include <QLineEdit>
 #include <QScreen>
 #include <QVBoxLayout>
@@ -191,8 +192,11 @@ void DenoteFileItemAction::createDenoteFile(const QString &dirPath, QWidget *par
     sigEdit->setPlaceholderText(QStringLiteral("(optional)"));
     form->addRow(QStringLiteral("Signature:"), sigEdit);
 
-    auto *extEdit = new QLineEdit(QStringLiteral(".org"));
-    form->addRow(QStringLiteral("Extension:"), extEdit);
+    auto *extCombo = new QComboBox();
+    extCombo->addItem(QStringLiteral(".md"));
+    extCombo->addItem(QStringLiteral(".org"));
+    extCombo->addItem(QStringLiteral(".txt"));
+    form->addRow(QStringLiteral("Format:"), extCombo);
 
     layout->addLayout(form);
 
@@ -217,9 +221,7 @@ void DenoteFileItemAction::createDenoteFile(const QString &dirPath, QWidget *par
     }
 
     const QString signature = sigEdit->text().trimmed();
-    QString ext = extEdit->text().trimmed();
-    if (!ext.startsWith(QLatin1Char('.')))
-        ext.prepend(QLatin1Char('.'));
+    const QString ext = extCombo->currentText();
 
     // Build filename and full path
     const QString filename = Denote::buildFilename(title, tags, signature, ext);