diff --git a/Surface_mesh_simplification/doc/Surface_mesh_simplification/Surface_mesh_simplification.txt b/Surface_mesh_simplification/doc/Surface_mesh_simplification/Surface_mesh_simplification.txt
index c2d5eee23e9..6c91ab2ca3a 100644
--- a/Surface_mesh_simplification/doc/Surface_mesh_simplification/Surface_mesh_simplification.txt
+++ b/Surface_mesh_simplification/doc/Surface_mesh_simplification/Surface_mesh_simplification.txt
@@ -317,12 +317,13 @@ results in a self intersection when one edge is collapsed using the Lindstrom-Tu
 
 
 \cgalFigureBegin{SMS-selfintersection, SMS-selfintersection.png}
-Simple mesh before and after the collapse of edge `e`.
+Simple mesh before and after the collapse of edge `v-w` into vertex `w`. While the normals of `f1`and `f2` are almost equal, they are opposed after the edge collapse.
 \cgalFigureEnd
 
 The class `Bounded_normal_change_placement` is a placement that checks if
-another placement inverts the normal of a face around the stars of the
-two vertices of an edge that is candidate for an edge collapse.
+another placement would invert the normal of a face around the stars of the
+two vertices of an edge that is candidate for an edge collapse.  It then
+returns 
 
 \cgalExample{Surface_mesh_simplification/edge_collapse_bounded_normal_change.cpp}