Add link to commutator docs about managing tether & counterweighting the headstage

Author: cjsha

source/Hardware Guide/Commutators/index.rst

@@ -3,9 +3,9 @@
 Coaxial Commutators
 ===================================
 Active, near-zero torque commutators prevent tether twisting during freely
-moving recordings with headstages and/or miniscopes.  This page provides a very
+moving recordings with headstages and/or miniscopes. This page provides a very
 brief overview of the commutators; for a more extensive walkthrough, please
-follow the documentation link for `Commutators
+follow the `commutator docs
 <https://open-ephys.github.io/commutator-docs/index.html>`__.
 
 :Design Repository: https://github.com/open-ephys/commutators
@@ -24,7 +24,7 @@ Overview
   ONIX Single Channel Commutator
 
 ONIX uses an active commutator to prevents tether twisting during freely moving
-recordings.  A inertial measurement unit (IMU) on the headstage or miniscope
+recordings. An inertial measurement unit (IMU) on the headstage or miniscope
 sends orientation data to the host computer. Because the real-time orientation
 of the animal is known, software can be used to send commands to the commutator
 via its USB interface, and the motor in the commutator will turn when the
@@ -33,6 +33,14 @@ maintains electrical connectivity for both power and high-frequency data
 signals between the tether leading to the headstage and the coaxial cable
 leading to the PCIe host board while turning.
 
+In addition to untwisting the tether, the commutator can also play a role in
+managing the tether so it doesn't get in the animal's way and counterweight-ing
+the headstage. This is performed by hooking a thin elastic string to the hook on
+the bottom of the commutator gear. For more information on how to do this, visit
+the `Tether Management and Headstage Counterweight
+<https://open-ephys.github.io/commutator-docs/user-guide/tether-management_counterweight.html>`_
+page.
+
 Features
 -------------------------
 - High bandwidth link up to 18 GHz