diff --git a/README.md b/README.md
index aea0385..8515fb6 100644
--- a/README.md
+++ b/README.md
@@ -72,11 +72,6 @@ For example, using the date of the file in question is a good way of ensuring th
 
 Once the data is in place, the program may be executed as normal - again make sure to run this on an NVidia GPU.  
 
-<!-- ## Screenshots -->
-
-<!-- TODO: add cool screenshots -->
+## Screenshots
 
 
-<!-- ## Modules -->
-
-<!-- TODO: talk about program design a little -->
diff --git a/src/gui/MainWindow.cpp b/src/gui/MainWindow.cpp
index 5b60944..08cc757 100644
--- a/src/gui/MainWindow.cpp
+++ b/src/gui/MainWindow.cpp
@@ -16,7 +16,7 @@
 // this is a blocking operation, and really does not follow any practices of code design
 // should really be a proper class like GpuBufferHandler.
 // also only loads temperature data
-void loadData(float* d_data, const int idx) {
+void loadData(float* d_data, const int idx, const int timestep) {
 
   std::vector<float> h_data;
   std::string path = "data/trimmed";
@@ -32,7 +32,7 @@ void loadData(float* d_data, const int idx) {
 
   float* hostVolume = new float[VOLUME_WIDTH * VOLUME_HEIGHT * VOLUME_DEPTH];
   for (int i = 0; i < VOLUME_WIDTH * VOLUME_HEIGHT * VOLUME_DEPTH; i++) {
-    hostVolume[i] = h_data[i + 0*VOLUME_DEPTH*VOLUME_HEIGHT*VOLUME_WIDTH];
+    hostVolume[i] = h_data[i + timestep*VOLUME_DEPTH*VOLUME_HEIGHT*VOLUME_WIDTH];
     // Discard missing values
     if (h_data[i + 0*VOLUME_DEPTH*VOLUME_HEIGHT*VOLUME_WIDTH] + epsilon >= infty) hostVolume[i] = -infty;
   }
@@ -170,7 +170,7 @@ void Window::tick() {
   this->widget->tick(1000.0/diff);
   if (this->widget->dateChanged) {
     // TODO: Load new date file here
-    loadData(this->data, this->widget->date);
+    loadData(this->data, this->widget->date, this->widget->timestep);
     this->widget->dateChanged = false;
   }
   if (this->widget->saveImage) {
diff --git a/src/gui/input/Widget.cpp b/src/gui/input/Widget.cpp
index 0a9ac26..c1fb603 100644
--- a/src/gui/input/Widget.cpp
+++ b/src/gui/input/Widget.cpp
@@ -51,6 +51,7 @@ void parseDate(char* string, int dayOfYear) {
 }
 
 Widget::Widget(GLFWwindow* window) : 
+  timestep(0),
   opacityK(63),
   sigmoidShift(0.5f),
   sigmoidExp(-250.0f),
@@ -168,6 +169,7 @@ void Widget::tick(double fps) {
   }
   ImGui::SameLine();
   ImGui::Text(this->dateString);
+  ImGui::DragInt("time step to load", &this->timestep, 1, 0, 3, "%d", ImGuiSliderFlags_AlwaysClamp);
   ImGui::DragInt("Samples per pixel", &this->samplesPerPixel, 1, 1, 16, "%d", ImGuiSliderFlags_AlwaysClamp);
   if (ImGui::Button("Save render")) this->saveImage = true;
   ImGui::End();
diff --git a/src/gui/input/Widget.h b/src/gui/input/Widget.h
index c72ea02..546caa7 100644
--- a/src/gui/input/Widget.h
+++ b/src/gui/input/Widget.h
@@ -34,6 +34,7 @@ private:
   ImGuiIO io;
   char *dateString;
   int samplesPerPixel;
+  int timestep;
 
   // transfer function controls
   int tfComboSelected;