diff --git a/images/en/flow_opacity_adapt_flow_preset.gif b/images/en/flow_opacity_adapt_flow_preset.gif
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diff --git a/reference_manual/brushes/brush_settings/opacity_and_flow.rst b/reference_manual/brushes/brush_settings/opacity_and_flow.rst
index bf7ef2cd6..3f268a165 100644
--- a/reference_manual/brushes/brush_settings/opacity_and_flow.rst
+++ b/reference_manual/brushes/brush_settings/opacity_and_flow.rst
@@ -1,46 +1,62 @@
 .. meta::
    :description:
         Opacity and flow in Krita.
 
 .. metadata-placeholder
 
    :authors: - Wolthera van Hövell tot Westerflier <griffinvalley@gmail.com>
              - Raghavendra Kamath <raghavendr.raghu@gmail.com>
              - Scott Petrovic
    :license: GNU free documentation license 1.3 or later.
 
 .. index:: Opacity, Flow, Transparency
 .. _option_opacity_n_flow:
 
 ================
 Opacity and Flow
 ================
 
 Opacity and flow are parameters for the transparency of a brush.
 
 .. image:: /images/en/Krita_Pixel_Brush_Settings_Flow.png
 
 They are interlinked with the painting mode setting.
 
 .. image:: /images/en/Krita_2_9_brushengine_opacity-flow_02.png
 
 Opacity
     The transparency of a stroke.
 Flow
     The transparency of separate dabs. Finally separated from Opacity in 2.9
 
 .. image:: /images/en/Krita_2_9_brushengine_opacity-flow_01.png
 
+
+.. versionchanged:: 4.2
+    In Krita 4.1 and below, the flow and opacity when combined with brush sensors would add up to one another, being only limited by the maximum opacity. This was unexpected compared to all other painting applications, so in 4.2 this finally got corrected to the flow and opacity multiplying, resulting in much more subtle strokes. This change can be switched back in the :ref:`tool_options_settings`, but we will be deprecating the old way in future versions.
+    
+    The old behaviour can be simulated in the new system by...
+    
+    1. Deactivating the sensors on opacity.
+    2. Set the maximum value on flow to 0.5
+    3. Adjusting the pressure curve to be concave.
+    
+    .. image:: /images/en/flow_opacity_adapt_flow_preset.gif
+
+
+
 Painting mode
 -------------
 
 Build-up
     Will treat opacity as if it were the same as flow.
 Wash
     Will treat opacity as stroke transparency instead of dab-transparency.
 
 .. image:: /images/en/Krita_2_9_brushengine_opacity-flow_03.png
 
 where the other images of this page had all three strokes set to painting mode: wash, this one is set to build-up.
 
+
+