diff --git a/doc/api_break.dox b/doc/api_break.dox
index b097f3e7c3b..3aa00f7424f 100644
--- a/doc/api_break.dox
+++ b/doc/api_break.dox
@@ -1154,6 +1154,8 @@ QgsExpression::Function       {#qgis_api_break_3_0_QgsExpression_Function}
 - `QgsExpression::Function::usesgeometry()` has been renamed to `QgsExpression::Function::usesGeometry( const NodeFunction* node )`
 - `QStringList QgsExpression::Function::referencedColumns()` has been changed to `QSet<QString> QgsExpression::Function::referencedColumns( const NodeFunction* node )`
 - `QgsExpression::Function::helptext()` has been renamed to `helpText()`
+- `QgsExpression::Function::func` has an additional parameter `node` that
+  provides access to the original node.
 
 QgsExpressionItem        {#qgis_api_break_3_0_QgsExpressionItem}
 -----------------