diff --git a/docs/source/images/PartialProjectSaveDialog.png b/docs/source/images/PartialProjectSaveDialog.png
new file mode 100644
index 0000000000000000000000000000000000000000..58f88cdfb173c0455a60012f9e4657665b148cf8
Binary files /dev/null and b/docs/source/images/PartialProjectSaveDialog.png differ
diff --git a/docs/source/release/v3.9.0/index.rst b/docs/source/release/v3.9.0/index.rst
index 60a8cdf3f7de85f1989bc348ea38a4d3265e76a3..cd9519e34e99acee0e64c015ddc1fbfa68643730 100644
--- a/docs/source/release/v3.9.0/index.rst
+++ b/docs/source/release/v3.9.0/index.rst
@@ -12,9 +12,9 @@ Mantid 3.9.0 Release Notes
 .. contents:: Table of Contents
    :local:
 
-We are proud to announce version 3.9 of Mantid. This release contains the long awaited ability to visualise non orthogonal crystal systems correctly in the slice viewer.
+We are proud to announce version 3.9 of Mantid. This release contains the long awaited ability to visualise non orthogonal crystal systems correctly in the slice viewer, as well as partial project saving in the Mantidplot interface.
 
-This is just one of many improvements in this release, so please take a
+These are just two of many improvements in this release, so please take a
 look at the release notes, which are filled with details of the
 important changes and improvements in many areas. The development team
 has put a great effort into making all of these improvements within
diff --git a/docs/source/release/v3.9.0/ui.rst b/docs/source/release/v3.9.0/ui.rst
index 2bace4096dac7a63c958acfc7eba7b43dfbc9274..b7ba040ff0c0698aa036ed113ae19308286493a6 100644
--- a/docs/source/release/v3.9.0/ui.rst
+++ b/docs/source/release/v3.9.0/ui.rst
@@ -9,6 +9,17 @@ UI & Usability Changes
 User Interface
 --------------
 
+Project Saving
+##############
+
+.. figure:: ../../images/PartialProjectSaveDialog.png
+   :class: screenshot
+   :width: 500px
+   :align: right
+
+- We have added a new dialog when saving a project that allows you to select which workspaces you want to save, and will tell you which graph windows will be included or excluded based on your selections.
+- The size of each workspace in memory is listed so you can speed up project saving (and reloading) by excluding large workspaces you do not need.
+
 Windows
 #######