diff --git a/Boolean_set_operations_2/doc/Boolean_set_operations_2/Boolean_set_operations_2.txt b/Boolean_set_operations_2/doc/Boolean_set_operations_2/Boolean_set_operations_2.txt
index c0cdc44ce46..cd2aed0b5da 100644
--- a/Boolean_set_operations_2/doc/Boolean_set_operations_2/Boolean_set_operations_2.txt
+++ b/Boolean_set_operations_2/doc/Boolean_set_operations_2/Boolean_set_operations_2.txt
@@ -119,8 +119,7 @@ In our context, a polygon must uphold the following conditions:
 <LI><I>Orientation</I> - the polygon's outer boundary must be <I>counter-clockwise oriented</I>.
 </OL>
 
-\subsection bso_ssecpolygon_with_holes_validation Conditions for Valid
-Polygons with Holes
+\subsection bso_ssecpolygon_with_holes_validation Conditions for Valid Polygons with Holes
 
 In our context, a polygon with holes must uphold the following conditions:
 
@@ -590,9 +589,7 @@ converted back to standard polygons.
 
 \cgalAdvancedEnd
 
-<!--=========================================================================-->
 \section bso_secbso_gen Boolean Set-Operations on General Polygons
-<!--=========================================================================-->
 
 \image html general_polygon.png
 \image latex general_polygon.png