diff --git a/docs/source/images/ISISReflectometryInterface/background_subtraction.png b/docs/source/images/ISISReflectometryInterface/background_subtraction.png
new file mode 100644
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diff --git a/docs/source/images/ISISReflectometryInterface/experiment_settings_tab.png b/docs/source/images/ISISReflectometryInterface/experiment_settings_tab.png
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diff --git a/docs/source/release/v5.1.0/reflectometry.rst b/docs/source/release/v5.1.0/reflectometry.rst
index 0be9fb8adc55ec2a5d15a65ac55e564804735e20..bfffda76499c1c34514d927326bc2c0686fb5f95 100644
--- a/docs/source/release/v5.1.0/reflectometry.rst
+++ b/docs/source/release/v5.1.0/reflectometry.rst
@@ -12,6 +12,19 @@ Reflectometry Changes
 ISIS Reflectometry Interface
 ############################
 
+New
+---
+
+.. figure:: ../../images/ISISReflectometryInterface/background_subtraction.png
+  :class: screenshot
+  :width: 700px
+  :align: right
+  :alt: Background subtraction on the ISIS Reflectometry Interface
+
+  *Background subtraction on the ISIS Reflectometry Interface*
+
+- Background subtraction options have been added to the ISIS Reflectometry Interface. The subtraction is performed using :ref:`algm-ReflectometryBackgroundSubtraction`.
+
 Bug fixes
 ---------