diff --git a/Kernel_23/doc/Kernel_23/CGAL/Bbox_3.h b/Kernel_23/doc/Kernel_23/CGAL/Bbox_3.h
index f44a44e4812..98c55a31366 100644
--- a/Kernel_23/doc/Kernel_23/CGAL/Bbox_3.h
+++ b/Kernel_23/doc/Kernel_23/CGAL/Bbox_3.h
@@ -115,6 +115,12 @@ Bbox_3& operator+=(const Bbox_3 &c);
 dilates the bounding box by a specified number of ULP.
 */
 void dilate(int dist);
+
+/*!
+scales the bounding box by a factor, while keeping its center fixed.
+*/
+void scale(double factor);
+
 /// @}
 
 }; /* end Bbox_3 */