diff --git a/Classification/include/CGAL/Classification/internal/auxiliary/random-forest/node.hpp b/Classification/include/CGAL/Classification/internal/auxiliary/random-forest/node.hpp
index 84f8d973014..9e02ed11400 100644
--- a/Classification/include/CGAL/Classification/internal/auxiliary/random-forest/node.hpp
+++ b/Classification/include/CGAL/Classification/internal/auxiliary/random-forest/node.hpp
@@ -28,6 +28,8 @@
 //  * changed inclusion protection tag
 //  * moved to namespace CGAL::internal::
 //  * fix computation of node_dist[label] so that results are always <= 1.0
+//  * change serialization functions to avoid a bug with boost and some
+//    compilers (that leads to dereferencing a null pointer)
 
 #ifndef CGAL_INTERNAL_LIBLEARNING_RANDOMFORESTS_NODE_H
 #define CGAL_INTERNAL_LIBLEARNING_RANDOMFORESTS_NODE_H