diff --git a/Polyline_simplification_2/doc/Polyline_simplification_2/Concepts/PolylineSimplificationTraits_2.h b/Polyline_simplification_2/doc/Polyline_simplification_2/Concepts/PolylineSimplificationTraits_2.h
index b99467ef974..9b7d2159acd 100644
--- a/Polyline_simplification_2/doc/Polyline_simplification_2/Concepts/PolylineSimplificationTraits_2.h
+++ b/Polyline_simplification_2/doc/Polyline_simplification_2/Concepts/PolylineSimplificationTraits_2.h
@@ -19,7 +19,7 @@ public:
 A function object to compute a squared distance for two points. 
 Provides the operator: 
 
-`FT operator()(Point_2 p, Point_2 q)` 
+`unspecified_type operator()(Point_2 p, Point_2 q)` 
 which returns the squared distance between `p` and `q`. 
 */ 
 typedef unspecified_type Compute_squared_distance_2;
diff --git a/Polyline_simplification_2/doc/Polyline_simplification_2/Concepts/PolylineSimplificationVertexBase_2.h b/Polyline_simplification_2/doc/Polyline_simplification_2/Concepts/PolylineSimplificationVertexBase_2.h
index 3d9c24e1301..ddba5e34187 100644
--- a/Polyline_simplification_2/doc/Polyline_simplification_2/Concepts/PolylineSimplificationVertexBase_2.h
+++ b/Polyline_simplification_2/doc/Polyline_simplification_2/Concepts/PolylineSimplificationVertexBase_2.h
@@ -21,7 +21,7 @@ Defines the same types as the `TriangulationVertexBase_2` concept
 
 class PolylineSimplificationVertexBase_2 {
 public:
-  /// A number type.
+  /// A number type which must be the same as the <code>FT</code> of the geometric traits class of the triangulation.
   typedef Hidden_type FT;
 
 /// \name Access Functions 
diff --git a/Polyline_simplification_2/doc/Polyline_simplification_2/PackageDescription.txt b/Polyline_simplification_2/doc/Polyline_simplification_2/PackageDescription.txt
index 9f3339d6880..7c4d4c8bdd8 100644
--- a/Polyline_simplification_2/doc/Polyline_simplification_2/PackageDescription.txt
+++ b/Polyline_simplification_2/doc/Polyline_simplification_2/PackageDescription.txt
@@ -21,9 +21,9 @@
 \cgalPkgManuals{Chapter_2D_Polyline_simplification,PkgPolylineSimplification2}
 \cgalPkgSummaryEnd
 \cgalPkgShortInfoBegin
-\cgalPkgSince{4.3}
+\cgalPkgSince{4.6}
 \cgalPkgDependsOn{\ref PkgTriangulation2Summary}
-\cgalPkgBib{cgal:fc-ps2}
+\cgalPkgBib{cgal:f-ps2}
 \cgalPkgLicense{\ref licensesGPL "GPL"}
 \cgalPkgDemo{Polygon Demo,polygon_2.zip}
 \cgalPkgShortInfoEnd