diff --git a/maintenance/cooling/figures/cooling.drawio b/maintenance/cooling/figures/cooling.drawio
new file mode 100644
index 0000000..8bf8070
--- /dev/null
+++ b/maintenance/cooling/figures/cooling.drawio
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diff --git a/maintenance/cooling/index.rst b/maintenance/cooling/index.rst
index d4bd5a0..ea923cc 100644
--- a/maintenance/cooling/index.rst
+++ b/maintenance/cooling/index.rst
@@ -1,10 +1,20 @@
 Liquid Cooling
 ===================================
 
+The instrument cooling system cools the cameras, computer CPUs and GPUs.  Facility glycol cools the instrument
+cooling system (liquid to liquid heat exchanger) and the rack air heat exchanger to remove heat from the rack.
+
+   .. image:: figures/cooling.png
+
+   *Instrument cooling system*
+
+Maintenance
+---------------
+
 Procedures and guidelines for maintenance of MagAO-X liquid cooling systems.
 
 .. toctree::
    :maxdepth: 2
 
    filter_cleaning
-   
+