diff --git a/Straight_skeleton_2/doc/Straight_skeleton_2/Concepts/PolygonOffsetBuilderTraits_2.h b/Straight_skeleton_2/doc/Straight_skeleton_2/Concepts/PolygonOffsetBuilderTraits_2.h
index f212ff4a593..4188620b70b 100644
--- a/Straight_skeleton_2/doc/Straight_skeleton_2/Concepts/PolygonOffsetBuilderTraits_2.h
+++ b/Straight_skeleton_2/doc/Straight_skeleton_2/Concepts/PolygonOffsetBuilderTraits_2.h
@@ -20,7 +20,10 @@ public:
 /*!
 A predicate object type.
 
-Must provide `Comparison_result operator()( FT d, const Trisegment_2_ptr& et) const`,
+Must provide
+
+`Comparison_result operator()( FT d, const Trisegment_2_ptr& et) const`,
+
 which compares the Euclidean distance `d` with the event time for `et`. Such event time
 is the Euclidean distance at which the <I>offset lines</I> intersect in a single point.
 The source of such offset lines is given by the three <I>oriented</I> lines defined by the edge-triple `et`.
@@ -33,7 +36,10 @@ typedef unspecified_type Compare_offset_against_event_time_2;
 /*!
 A construction object type.
 
-Must provide `boost::optional<Point_2> operator()(const FT& t, const Segment_2& e0, const Segment_2& e1, const Trisegment_2_ptr& et) const`,
+Must provide
+
+`boost::optional<Point_2> operator()(const FT& t, const Segment_2& e0, const Segment_2& e1, const Trisegment_2_ptr& et) const`,
+
 which constructs the point of intersection of the lines obtained by offsetting
 the oriented lines given by `e0` and `e0` an Euclidean distance `t`.
 
diff --git a/Straight_skeleton_2/doc/Straight_skeleton_2/Concepts/StraightSkeletonBuilderTraits_2.h b/Straight_skeleton_2/doc/Straight_skeleton_2/Concepts/StraightSkeletonBuilderTraits_2.h
index f57b2b8e5c9..bdb3b62b2e3 100644
--- a/Straight_skeleton_2/doc/Straight_skeleton_2/Concepts/StraightSkeletonBuilderTraits_2.h
+++ b/Straight_skeleton_2/doc/Straight_skeleton_2/Concepts/StraightSkeletonBuilderTraits_2.h
@@ -123,12 +123,7 @@ typedef unspecified_type Construct_ss_event_time_and_point_2;
 /*!
 A construction object type.
 
-Must provide `Trisegment_2_ptr operator()( const Segment_2& e0,
-                                           const FT& w0,
-                                           const Segment_2& e1,
-                                           const FT& w1,
-                                           const Segment_2& e2,
-                                           const FT& w2 ) const`,
+Must provide `Trisegment_2_ptr operator()( const Segment_2& e0, const FT& w0, const Segment_2& e1, const FT& w1, const Segment_2& e2, const FT& w2 ) const`,
 
 which returns an intrusive pointer to an object containing the three <I>oriented</I> lines
 defined by the three input edges.
@@ -160,10 +155,7 @@ A predicate object type.
 
 Must provide
 
-`CGAL::Oriented_side operator()( const Trisegment_2_ptr& e,
-                                 const Segment_2& e0, const FT& w0,
-                                 const Segment_2& e1, const FT& w1,
-                                 const Trisegment_2_ptr& e01_event, bool e0_is_primary) const`,
+`CGAL::Oriented_side operator()( const Trisegment_2_ptr& e, const Segment_2& e0, const FT& w0, const Segment_2& e1, const FT& w1, const Trisegment_2_ptr& e01_event, bool e0_is_primary) const`,
 
 which returns the oriented side of the event point described by the edge triple `e`
 w.r.t. the (positive) bisector `[e0,e1]`.