diff --git a/Quadrical_kernel_3/doc_tex/Quadrical_kernel_3/QK.tex b/Quadrical_kernel_3/doc_tex/Quadrical_kernel_3/QK.tex
index a13cb30b349..e71075e72e4 100644
--- a/Quadrical_kernel_3/doc_tex/Quadrical_kernel_3/QK.tex
+++ b/Quadrical_kernel_3/doc_tex/Quadrical_kernel_3/QK.tex
@@ -70,7 +70,9 @@ arc are finite, (b)~one end of an arc is finite, like a ``ray'', or
 whether different types should be introduced, or
 all can be encoded by a single ``polymorphic'' type. In the latter
 case, end-points can only be accessed if they are finite. As mentioned before,
-in a homogenous version, this condition can be removed.
+in a homogenous version, this condition can be removed. To find the 
+proper splitting of a \ccc{Curve_3} into maximal \ccc{Curve_arc_3}s depends
+on this question.
 
 \section{Acknowledgements}