diff --git a/pylonrecorder.cpp b/pylonrecorder.cpp
index 9992c8e..9cd6541 100644
--- a/pylonrecorder.cpp
+++ b/pylonrecorder.cpp
@@ -877,12 +877,12 @@ QColor PylonRecorder::progressColor(int value) {
 }
 
 
-std::string PylonRecorder::createFilename(const std::string &extension) {
+std::string PylonRecorder::createFilename(const std::string &suffix, const std::string &extension) {
   QDateTime dt(QDateTime::currentDateTimeUtc());
   QDate date = dt.date();
   std::string base = (date.toString("yyyy.MM.dd") + "_").toStdString();
   QString idx = QString::number(movieCount);
-  std::string fname = base + idx.toStdString() + extension;
+  std::string fname = base + idx.toStdString() + suffix + extension;
   while (QFile::exists(QString::fromStdString(fname))) {
       movieCount++;
       fname = base + QString::number(movieCount).toStdString() + extension;
diff --git a/pylonrecorder.h b/pylonrecorder.h
index 9c9ebb5..a77f401 100644
--- a/pylonrecorder.h
+++ b/pylonrecorder.h
@@ -81,7 +81,7 @@ private:
     void setExperimenterName();
     void setSubjectID();
     QColor progressColor(int value);
-    std::string createFilename(const std::string &extension=".raw");
+    std::string createFilename(const std::string &suffix="", const std::string &extension=".raw");
     void cameraConfiguration();
     VideoSpecs getVideoSpecs(const ImageSettings &settings);
     void startSinglecamRecording();