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docs/level_h/README.md

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-# Step-by-Step Guides Quick Reference
+# HOWTO Guides Quick Reference
 
 Here is a list of guides for performing common modifications or supplemental builds for your 3D printer. Some are specific to Troodon, as noted, and some are suitable for any 3D printer. 
 
 ## Specific to the Troodon 2.0 Pro 
+- BTT Sensor - Install the BTT Smart Filament Sensor as an alternative to the stock filament runout sensor.
 - [Rockers](https://github.com/500Foods/WelcomeToTroodon/blob/main/docs/level_h/rockers.md) - Make it easier to get into the electronics bay
 - Chamber Lighting - Dramatically better lighting option
 - Install a 5V Buck Converter - Add a 5V power source to run LEDs