diff --git a/SMDS_3/include/CGAL/Mesh_complex_3_in_triangulation_3.h b/SMDS_3/include/CGAL/Mesh_complex_3_in_triangulation_3.h
index a2d53e0e71b..931a8fabc8f 100644
--- a/SMDS_3/include/CGAL/Mesh_complex_3_in_triangulation_3.h
+++ b/SMDS_3/include/CGAL/Mesh_complex_3_in_triangulation_3.h
@@ -449,7 +449,7 @@ public:
     v->set_dimension(-1);
   }
 
-  /** sets index of vertex \p vertex to \p index
+  /** sets the index of vertex \p vertex to \p index
   */
   void set_index(const Vertex_handle& vertex, const Index& index) const
   {