diff --git a/.gitattributes b/.gitattributes
index 052b0e6afb3..53334b34d9f 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -1397,6 +1397,13 @@ Modifier/doc_tex/Modifier/idraw/modifier.eps -text svneol=unset#application/post
 Modifier/doc_tex/Modifier/idraw/modifier.pdf -text svneol=unset#application/pdf
 Modifier/doc_tex/Modifier/modifier.gif -text svneol=unset#image/gif
 Modifier/doc_tex/Modifier/modifier_small.gif -text svneol=unset#image/gif
+Modular_arithmetic/doc_tex/Modular_arithmetic/main.tex -text
+Modular_arithmetic/doc_tex/Modular_arithmetic_ref/Modular.tex -text
+Modular_arithmetic/doc_tex/Modular_arithmetic_ref/ModularTraits.tex -text
+Modular_arithmetic/doc_tex/Modular_arithmetic_ref/ModularTraits_ModularImage.tex -text
+Modular_arithmetic/doc_tex/Modular_arithmetic_ref/Modularizable.tex -text
+Modular_arithmetic/doc_tex/Modular_arithmetic_ref/intro.tex -text
+Modular_arithmetic/doc_tex/Modular_arithmetic_ref/main.tex -text
 Modular_arithmetic/test/Modular_arithmetic/Modular_traits.C -text
 Nef_2/demo/Nef_2/filtered_homogeneous_data/complex.nef -text svneol=native#application/octet-stream
 Nef_2/demo/Nef_2/filtered_homogeneous_data/symmdif.nef -text svneol=native#application/octet-stream
diff --git a/Modular_arithmetic/doc_tex/Modular_arithmetic/main.tex b/Modular_arithmetic/doc_tex/Modular_arithmetic/main.tex
new file mode 100644
index 00000000000..4ba86316d85
--- /dev/null
+++ b/Modular_arithmetic/doc_tex/Modular_arithmetic/main.tex
@@ -0,0 +1,4 @@
+\cleardoublepage
+\ccUserChapter{Modular Arithmetic}
+\label{chap:modular_arithmetic}
+\ccChapterAuthor{Michael Hemmer}
\ No newline at end of file
diff --git a/Modular_arithmetic/doc_tex/Modular_arithmetic_ref/Modular.tex b/Modular_arithmetic/doc_tex/Modular_arithmetic_ref/Modular.tex
new file mode 100644
index 00000000000..991b93256e1
--- /dev/null
+++ b/Modular_arithmetic/doc_tex/Modular_arithmetic_ref/Modular.tex
@@ -0,0 +1,71 @@
+\begin{ccRefClass} {Modular}
+\label{Modular}
+
+\def\ccTagOperatorLayout{\ccFalse}
+
+\ccDefinition
+
+The class \ccRefName\ represents a finite field $\Z{/p\Z}$, 
+for some prime number $p$. \\
+
+The prime number $p$ is stored in a static member variable. 
+The class provides static member functions to change this value. 
+{\bf Note that changing the prime invalidates already existing objects 
+of this type.}
+However, already existing objects do not lose their value with respect to the 
+old prime and can be reused after restoring the old prime. 
+Since the type is base on double 
+arithmetic the prime is restricted to values less than $2^{26}$. 
+The initial value of $p$ is 67111067. 
+
+\ccInclude{CGAL/Modular.h}
+
+\ccIsModel
+\ccc{Field}\\
+
+
+\ccCreation
+\ccCreationVariable{x}
+
+\ccConstructor{Modular();}
+{introduces a variable \ccVar, which is initalized with zero;}
+\ccGlue
+\ccConstructor{Modular(const Modular& m);}
+{copy constructor;}
+\ccGlue
+\ccConstructor{Modular(int i);}
+{intorduces a variable \ccVar, which is initalized with $i \%  p$;}
+\ccGlue
+\ccConstructor{Modular(long i);}
+{intorduces a variable \ccVar, which is initalized with $i \%  p$;}
+
+\ccOperations
+
+\ccMethod{static int set_current_prime(int p);}{ 
+        Static member function;\\
+        sets current prime to the given value and returns the old prime. }
+\ccGlue
+\ccMethod{static int get_current_prime();}{
+        Static member function;\\
+        returns the value of the current prime.      
+    }
+\ccGlue
+\ccMethod{int  get_value() const;}{
+        Returns the value of \ccVar. 
+    }
+
+
+\ccFunction{Modular operator+(const Modular&a);}{}\ccGlue
+\ccFunction{Modular operator-(const Modular&a);}{}\ccGlue
+
+\ccFunction{Modular operator+(const Modular&a,const Modular& b);}{}\ccGlue
+\ccFunction{Modular operator-(const Modular&a,const Modular& b);}{}\ccGlue
+\ccFunction{Modular operator*(const Modular&a,const Modular& b);}{}\ccGlue
+\ccFunction{Modular operator/(const Modular&a,const Modular& b);}{}\ccGlue
+
+\ccMethod{Modular & operator+=(const Modular& a);}{}\ccGlue
+\ccMethod{Modular & operator-=(const Modular& a);}{}\ccGlue
+\ccMethod{Modular & operator*=(const Modular& a);}{}\ccGlue
+\ccMethod{Modular & operator/=(const Modular& a);}{}\ccGlue
+
+\end{ccRefClass} 
diff --git a/Modular_arithmetic/doc_tex/Modular_arithmetic_ref/ModularTraits.tex b/Modular_arithmetic/doc_tex/Modular_arithmetic_ref/ModularTraits.tex
new file mode 100644
index 00000000000..0bc3222e5a9
--- /dev/null
+++ b/Modular_arithmetic/doc_tex/Modular_arithmetic_ref/ModularTraits.tex
@@ -0,0 +1,42 @@
+\begin{ccRefConcept}{ModularTraits}
+
+\ccDefinition
+
+A model of \ccc{ModularTraits} is associated to specific \ccc{Type}.
+In case this type is \ccc{Modularizable}, this is indicated by the 
+
+ and reflects the properties of this type with respect 
+to the concept \ccc{Modular}.
+
+\ccTypes
+
+A model of \ccc{ModularTraits} is supposed to provide:\\
+
+\ccNestedType{Type        }{The associated type.}
+\ccGlue
+
+\ccNestedType{Is_modularizable}{ 
+  Tag indicating whether the associated type is modularizable. \\
+  This is either \ccc{CGAL::Tag_true} or \ccc{CGAL::Tag_false}. }
+
+\ccGlue
+\ccNestedType{Modular_type}{
+   The type of the modular image. \\
+   In case the type is not \ccc{Modularizable} this is undefined. 
+}
+
+\ccHeading{Functors}
+
+In case the associated type is \ccc{Modularizable} all functors are provided.\\
+In case a functor is not provided, it is set to \ccc{CGAL::Null_functor}.
+
+
+\ccNestedType{Modular_image}{A model of \ccc{ModularTraits::ModularImage} } 
+\ccGlue
+\ccNestedType{Modular_image_inverse}{A model of \ccc{ModularTraits::ModularImageInverse} } 
+
+
+\ccHasModels
+\ccRefIdfierPage{Modular_traits}\\
+
+\end{ccRefConcept}
diff --git a/Modular_arithmetic/doc_tex/Modular_arithmetic_ref/ModularTraits_ModularImage.tex b/Modular_arithmetic/doc_tex/Modular_arithmetic_ref/ModularTraits_ModularImage.tex
new file mode 100644
index 00000000000..a7248bccd80
--- /dev/null
+++ b/Modular_arithmetic/doc_tex/Modular_arithmetic_ref/ModularTraits_ModularImage.tex
@@ -0,0 +1,28 @@
+\begin{ccRefFunctionObjectConcept}{ModularTraits::ModularImage}
+
+\ccDefinition
+
+This \ccc{AdaptableUnaryFunction} computes the modular image of the given value 
+with respect to the homomorphism $\varphi$ from the \ccc{ModularTraits::Type} into
+\ccc{ModularTraits::Modular_type}.
+
+The homomorphism preserves the mapping of \ccc{int} into both types
+, i.e., $\varphi(Type(i)) == Modular\_type(i)$.
+
+
+\ccTypes
+\ccTypedef{typedef ModularTraits::Modular_type result_type;}{}
+\ccTypedef{typedef ModularTraits::Modular_type argument_type;}{}
+
+\ccCreationVariable{fo}
+
+\ccMethod{
+result_type
+operator()(const  argument_type &);}{
+computes $\varphi(x)$.
+} 
+ 
+\ccRefines 
+\ccc{AdaptableUnaryFunction} 
+
+\end{ccRefFunctionObjectConcept}
\ No newline at end of file
diff --git a/Modular_arithmetic/doc_tex/Modular_arithmetic_ref/Modularizable.tex b/Modular_arithmetic/doc_tex/Modular_arithmetic_ref/Modularizable.tex
new file mode 100644
index 00000000000..f50901a973e
--- /dev/null
+++ b/Modular_arithmetic/doc_tex/Modular_arithmetic_ref/Modularizable.tex
@@ -0,0 +1,18 @@
+\begin{ccRefConcept}{Modularizable}
+
+\ccDefinition
+
+An algebraic structure is called \ccRefName, if there is an suitable mapping into 
+an algebraic structure, which is based on the type \ccc{CGAL::Modular}. 
+For scalar types, e.g. Integers, this mapping is just the kanonical homomorphism 
+into the type \ccc{CGAL::Modular}. For compount types, e.g. Polynomials, 
+the mapping is applied to the coefficient of the compount type. 
+
+The mapping is provided via \ccc{CGAL::Modular_traits<Modularizable>}, 
+being a model of \ccc{ModularTraits}.
+
+\ccSeeAlso
+\ccRefIdfierPage{Modular}\\
+\ccRefIdfierPage{ModularTraits}\\
+
+\end{ccRefConcept}
\ No newline at end of file
diff --git a/Modular_arithmetic/doc_tex/Modular_arithmetic_ref/intro.tex b/Modular_arithmetic/doc_tex/Modular_arithmetic_ref/intro.tex
new file mode 100644
index 00000000000..26f9ad8ede4
--- /dev/null
+++ b/Modular_arithmetic/doc_tex/Modular_arithmetic_ref/intro.tex
@@ -0,0 +1,5 @@
+\section{Classified Reference Pages}
+
+\subsection*{Types}
+
+ 
\ No newline at end of file
diff --git a/Modular_arithmetic/doc_tex/Modular_arithmetic_ref/main.tex b/Modular_arithmetic/doc_tex/Modular_arithmetic_ref/main.tex
new file mode 100644
index 00000000000..48a09e9f076
--- /dev/null
+++ b/Modular_arithmetic/doc_tex/Modular_arithmetic_ref/main.tex
@@ -0,0 +1,11 @@
+\ccRefChapter{Modular Arithmetic } 
+\label{chap:modular_arithmetic_ref}
+\ccChapterAuthor{Michael Hemmer}
+
+\input{Modular_arithmetic_ref/intro}
+
+\input{Modular_arithmetic_ref/Modular}
+\input{Modular_arithmetic_ref/Modularizable}
+\input{Modular_arithmetic_ref/ModularTraits}
+\input{Modular_arithmetic_ref/ModularTraits_ModularImage}
+