diff --git a/tutorials/4-developers/DTDV401_overview.ipynb b/tutorials/4-developers/DTDV401_overview.ipynb
index 9bb7dd1e3..61ab9d2d4 100644
--- a/tutorials/4-developers/DTDV401_overview.ipynb
+++ b/tutorials/4-developers/DTDV401_overview.ipynb
@@ -303,19 +303,19 @@
    "source": [
     "All the classes in the following modules extend `Feature` and represent transformations in some way:\n",
     "\n",
-    "- [scatterers.py](https://github.com/DeepTrackAI/DeepTrack2/blob/develop/deeptrack/scatterers.py) provides a framework for implementing light-scattering objects.\n",
+    "- [scatterers.py](https://github.com/DeepTrackAI/DeepTrack2/blob/develop/deeptrack/optical/scatterers.py) provides a framework for implementing light-scattering objects.\n",
     "\n",
-    "- [optics.py](https://github.com/DeepTrackAI/DeepTrack2/blob/develop/deeptrack/optics.py) provides a framework for simulating the optics of a variety of microscopy setups such as darkfield, fluorescence, or brightfield, as well as for incorporating the interaction between a sample (often a scatterer object) and a microscopy setup.\n",
+    "- [optics.py](https://github.com/DeepTrackAI/DeepTrack2/blob/develop/deeptrack/optical/optics.py) provides a framework for simulating the optics of a variety of microscopy setups such as darkfield, fluorescence, or brightfield, as well as for incorporating the interaction between a sample (often a scatterer object) and a microscopy setup.\n",
     "\n",
-    "- [holography.py](https://github.com/DeepTrackAI/DeepTrack2/blob/develop/deeptrack/holography.py) provides features for managing optical fields with Fourier transforms and propagation matrices for usage in simulation pipelines and holographic reconstructions.\n",
+    "- [holography.py](https://github.com/DeepTrackAI/DeepTrack2/blob/develop/deeptrack/optical/holography.py) provides features for managing optical fields with Fourier transforms and propagation matrices for usage in simulation pipelines and holographic reconstructions.\n",
     "\n",
-    "- [aberrations.py](https://github.com/DeepTrackAI/DeepTrack2/blob/develop/deeptrack/aberrations.py) provides a framework to simulate optical aberrations in microscopy setups by implementing Zernike polynomials and Gaussian pupil apodization.\n",
+    "- [aberrations.py](https://github.com/DeepTrackAI/DeepTrack2/blob/develop/deeptrack/optical/aberrations.py) provides a framework to simulate optical aberrations in microscopy setups by implementing Zernike polynomials and Gaussian pupil apodization.\n",
     "\n",
-    "- [augmentations.py](https://github.com/DeepTrackAI/DeepTrack2/blob/develop/deeptrack/augmentations.py) provides a framework to augment data with various transformations and image manipulation techniques such as rotations, deformations, cropping, padding.\n",
+    "- [augmentations.py](https://github.com/DeepTrackAI/DeepTrack2/blob/develop/deeptrack/optical/augmentations.py) provides a framework to augment data with various transformations and image manipulation techniques such as rotations, deformations, cropping, padding.\n",
     "\n",
-    "- [noises.py](https://github.com/DeepTrackAI/DeepTrack2/blob/develop/deeptrack/noises.py) provides a framework to add various types of additive noise to images as well as Poisson noise based on signal-to-noise ratio.\n",
+    "- [noises.py](https://github.com/DeepTrackAI/DeepTrack2/blob/develop/deeptrack/optical/noises.py) provides a framework to add various types of additive noise to images as well as Poisson noise based on signal-to-noise ratio.\n",
     "\n",
-    "- [math.py](https://github.com/DeepTrackAI/DeepTrack2/blob/develop/deeptrack/math.py) provides utilities for various types of normalization, blurring, pooling, and resizing of images."
+    "- [math.py](https://github.com/DeepTrackAI/DeepTrack2/blob/develop/deeptrack/optical/math.py) provides utilities for various types of normalization, blurring, pooling, and resizing of images."
    ]
   },
   {