diff --git a/docs/source/release/v5.1.0/diffraction.rst b/docs/source/release/v5.1.0/diffraction.rst
index d4c0041287b2310f43156cddeda2fe8b045647e2..6a86de8a8e6c03acb1590156efefb2db30928069 100644
--- a/docs/source/release/v5.1.0/diffraction.rst
+++ b/docs/source/release/v5.1.0/diffraction.rst
@@ -14,6 +14,10 @@ Powder Diffraction
 
 Engineering Diffraction
 -----------------------
+Improvements
+^^^^^^^^^^^^
+- TOPAS files (`.abc`) have replaced the `.dat` files generated when focusing using the GUI.
+- Focusing with the GUI will now generate a CSV containing the averaged values of all numerical sample logs.
 
 Single Crystal Diffraction
 --------------------------