--- a/include/Scintilla.iface
+++ b/include/Scintilla.iface
@@ -2126,6 +2126,12 @@
 # Find the position of a character from a point within the window.
 # Return INVALID_POSITION if not close to text.
 fun position CharPositionFromPointClose=2562(int x, int y)
+
+# Set whether switching to rectangular mode while selecting with the mouse is allowed.
+set void SetMouseSelectionRectangularSwitch=2668(bool mouseSelectionRectangularSwitch,)
+
+# Whether switching to rectangular mode while selecting with the mouse is allowed.
+get bool GetMouseSelectionRectangularSwitch=2669(,)
 
 # Set whether multiple selections can be made
 set void SetMultipleSelection=2563(bool multipleSelection,)