diff --git a/Kernel_d/include/CGAL/Kernel_d/Matrix__.h b/Kernel_d/include/CGAL/Kernel_d/Matrix__.h
index 8d64f866565..db5b35633c4 100644
--- a/Kernel_d/include/CGAL/Kernel_d/Matrix__.h
+++ b/Kernel_d/include/CGAL/Kernel_d/Matrix__.h
@@ -431,8 +431,7 @@ Matrix_<NT_,AL_>& operator-=(const Matrix_<NT_,AL_>&);
 Matrix_<NT_,AL_>& operator+=(const Matrix_<NT_,AL_>&); 
 
 Matrix_<NT_,AL_> operator*(const Matrix_<NT_,AL_>& M1) const; 
-/*{\Mbinop Multiplication. \precond \\ 
-|\Mvar.column_dimension() = M1.row_dimension()|. }*/
+/*{\Mbinop Multiplication. \precond \\ |\Mvar.column_dimension() = M1.row_dimension()|. }*/
 
 Vector_<NT_,AL_> 
 operator*(const Vector_<NT_,AL_>& vec) const
diff --git a/Kernel_d/include/CGAL/Kernel_d/Vector__.h b/Kernel_d/include/CGAL/Kernel_d/Vector__.h
index a2a8e7c7d35..b03e4be341a 100644
--- a/Kernel_d/include/CGAL/Kernel_d/Vector__.h
+++ b/Kernel_d/include/CGAL/Kernel_d/Vector__.h
@@ -240,16 +240,13 @@ const_iterator begin() const { return v_; }
 const_iterator end() const { return v_+d_; }
 
 Vector_<NT_,AL_>  operator+(const Vector_<NT_,AL_>& v1) const;
-/*{\Mbinop Addition. \precond\\ 
-|v.dimension() == v1.dimension()|.}*/
+/*{\Mbinop Addition. \precond\\ |v.dimension() == v1.dimension()|.}*/
 
 Vector_<NT_,AL_>  operator-(const Vector_<NT_,AL_>& v1) const;
-/*{\Mbinop Subtraction. \precond\\ 
-|v.dimension() = v1.dimension()|.}*/
+/*{\Mbinop Subtraction. \precond\\ |v.dimension() = v1.dimension()|.}*/
 
 NT operator*(const Vector_<NT_,AL_>& v1) const;
-/*{\Mbinop Inner Product. \precond\\ 
-|v.dimension() = v1.dimension()|.}*/
+/*{\Mbinop Inner Product. \precond\\ |v.dimension() = v1.dimension()|.}*/
 
 Vector_<NT_,AL_> compmul(const NT& r) const;
 
@@ -261,8 +258,7 @@ Vector_<NT_,AL_>& operator+=(const Vector_<NT_,AL_>& v1);
 |v.dimension() == v1.dimension()|.}*/
 
 Vector_<NT_,AL_>& operator-=(const Vector_<NT_,AL_>& v1);
-/*{\Mbinop Subtraction plus assignment. \precond\\ 
-|v.dimension() == v1.dimension()|.}*/
+/*{\Mbinop Subtraction plus assignment. \precond\\ |v.dimension() == v1.dimension()|.}*/
 
 Vector_<NT_,AL_>& operator*=(const NT& s);
 /*{\Mbinop Scalar multiplication plus assignment.}*/