diff --git a/docs/hardware_dev/index.rst b/docs/hardware_dev/index.rst
index 3082b65f..bdb2ea41 100644
--- a/docs/hardware_dev/index.rst
+++ b/docs/hardware_dev/index.rst
@@ -8,8 +8,9 @@ This section will describe how to build the BusKill hardware cable.
 For information on how to setup and use the BusKill cable before using the BusKill app, see :ref:`hardware_usr`
 
 .. toctree::
-   :maxdepth: 3
+   :maxdepth: 4
 
    bom
    assembly
    storage
+   3d-print