diff --git a/src/chroma_window.cpp b/src/chroma_window.cpp
index a9ed0f7..898eaf3 100644
--- a/src/chroma_window.cpp
+++ b/src/chroma_window.cpp
@@ -4,7 +4,7 @@
 #include<cstdlib>
 
 ChromaWindow::ChromaWindow(QWidget *parent) : QDialog(parent) {
-    setFixedSize(400, 240);
+    setFixedSize(400, 300);
     setWindowTitle(tr("Chroma Key"));
     setWindowIcon(QPixmap(":/images/icon.png"));
     createControls();
@@ -89,6 +89,12 @@ void ChromaWindow::createControls() {
     highButton = new QPushButton("Set", this);
     highButton->setGeometry(300, 90, 25, 20);
     
+    select_mode = new QComboBox(this);
+    select_mode->setGeometry(15, 235, 290, 25);
+    
+    select_mode->addItem("Replace with Filter");
+    select_mode->addItem("Replace with Image");
+    
     connect(color_add, SIGNAL(clicked()), this, SLOT(colorAdd()));
     connect(color_remove, SIGNAL(clicked()), this, SLOT(colorRemove()));
     connect(color_okay, SIGNAL(clicked()), this, SLOT(colorSet()));
diff --git a/src/chroma_window.h b/src/chroma_window.h
index 0869fe2..b4bcfcc 100644
--- a/src/chroma_window.h
+++ b/src/chroma_window.h
@@ -30,6 +30,7 @@ private:
     std::vector<ac::Keys> colorkeys_vec;
     QPushButton *lowButton, *highButton;
     QColor set_low_color, set_high_color;
+    QComboBox *select_mode;
 };