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diff --git a/Documentation/user-manual.txt b/Documentation/user-manual.txt
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--- a/Documentation/user-manual.txt
+++ b/Documentation/user-manual.txt
@@ -1943,6 +1943,28 @@ logging of cylinder pressures during sidemount involves three steps, exactly as
 
 image::images/sidemount1.jpg["FIGURE: Sidemount profile",align="center"]
 
+==== Fixing sensor being attached to wrong cylinder
+
+When importing a dive _Subsurface_ generally has to make some assumptions when importing dives. One
+of these assumptions is which cylinder a pressure sensor is attached to. The following dive is a sidemount
+dive with two deco cylinders. Each of the main cylinders has a pressure sensor attached to them. In this
+case _Subsurface_ only knows about 3 gasses and 2 sensors so it makes the assumption that the sensors
+are attached to the first two cylinders, one bottom gas and one with deco gas.
+
+image::images/sensors-import.png["FIGURE: Imported cylinders and sensors",align="center"]
+
+To fix this, you can add a new unused bottom gas cylinder.
+
+image::images/sensors-newcylinder.png["FIGURE: New cylinder added for sensor move",align="center"]
+
+To then move the sensor from the 2nd cylinder to the newly added one replace the text *Select one of these cylinders: 0,1*
+with *1* and press Enter.
+
+image::images/sensors-moved.png["FIGURE: Sensor moved to new cylinder",align="center"]
+
+The sensor will then be associated with this new cylinder and the profile graph will be updated to
+reflect this change.
+
 [[S_sSCR_dives]]
 ==== Passive semi-closed circuit rebreather (pSCR) dives