diff --git a/Eigen/SparseCore b/Eigen/SparseCore
index c4535ea3e..9a7d11124 100644
--- a/Eigen/SparseCore
+++ b/Eigen/SparseCore
@@ -13,7 +13,8 @@
 
 namespace Eigen {
 
-/** \defgroup Sparse_Module SparseCore module
+/** \ingroup Sparse_modules
+  * \defgroup SparseCore_Module SparseCore module
   *
   * This module provides a sparse matrix representation, and basic associatd matrix manipulations
   * and operations.
diff --git a/Eigen/src/SparseCore/AmbiVector.h b/Eigen/src/SparseCore/AmbiVector.h
index 22f3ff062..93d20b98c 100644
--- a/Eigen/src/SparseCore/AmbiVector.h
+++ b/Eigen/src/SparseCore/AmbiVector.h
@@ -25,6 +25,8 @@
 #ifndef EIGEN_AMBIVECTOR_H
 #define EIGEN_AMBIVECTOR_H
 
+namespace internal {
+
 /** \internal
   * Hybrid sparse/dense vector class designed for intensive read-write operations.
   *
@@ -375,5 +377,6 @@ class AmbiVector<_Scalar,_Index>::Iterator
     bool m_isDense;             // mode of the vector
 };
 
+} // namespace internal
 
 #endif // EIGEN_AMBIVECTOR_H
diff --git a/Eigen/src/SparseCore/CompressedStorage.h b/Eigen/src/SparseCore/CompressedStorage.h
index 9d2fb7231..14816b8f3 100644
--- a/Eigen/src/SparseCore/CompressedStorage.h
+++ b/Eigen/src/SparseCore/CompressedStorage.h
@@ -25,7 +25,10 @@
 #ifndef EIGEN_COMPRESSED_STORAGE_H
 #define EIGEN_COMPRESSED_STORAGE_H
 
-/** Stores a sparse set of values as a list of values and a list of indices.
+namespace internal {
+
+/** \internal
+  * Stores a sparse set of values as a list of values and a list of indices.
   *
   */
 template<typename _Scalar,typename _Index>
@@ -236,4 +239,6 @@ class CompressedStorage
 
 };
 
+} // namespace internal
+
 #endif // EIGEN_COMPRESSED_STORAGE_H
diff --git a/Eigen/src/SparseCore/MappedSparseMatrix.h b/Eigen/src/SparseCore/MappedSparseMatrix.h
index 31a431fb2..8f23bfffa 100644
--- a/Eigen/src/SparseCore/MappedSparseMatrix.h
+++ b/Eigen/src/SparseCore/MappedSparseMatrix.h
@@ -63,7 +63,6 @@ class MappedSparseMatrix
     inline Index cols() const { return IsRowMajor ? m_innerSize : m_outerSize; }
     inline Index innerSize() const { return m_innerSize; }
     inline Index outerSize() const { return m_outerSize; }
-    inline Index innerNonZeros(Index j) const { return m_outerIndex[j+1]-m_outerIndex[j]; }
 
     //----------------------------------------
     // direct access interface
diff --git a/Eigen/src/SparseCore/SparseMatrix.h b/Eigen/src/SparseCore/SparseMatrix.h
index 87ff2ecf4..56811ce27 100644
--- a/Eigen/src/SparseCore/SparseMatrix.h
+++ b/Eigen/src/SparseCore/SparseMatrix.h
@@ -83,7 +83,7 @@ class SparseMatrix
 
     typedef MappedSparseMatrix<Scalar,Flags> Map;
     using Base::IsRowMajor;
-    typedef CompressedStorage<Scalar,Index> Storage;
+    typedef internal::CompressedStorage<Scalar,Index> Storage;
     enum {
       Options = _Options
     };
@@ -96,7 +96,7 @@ class SparseMatrix
     Index m_innerSize;
     Index* m_outerIndex;
     Index* m_innerNonZeros;     // optional, if null then the data is compressed
-    CompressedStorage<Scalar,Index> m_data;
+    Storage m_data;
     
     Eigen::Map<Matrix<Index,Dynamic,1> > innerNonZeros() { return Eigen::Map<Matrix<Index,Dynamic,1> >(m_innerNonZeros, m_innerNonZeros?m_outerSize:0); }
     const  Eigen::Map<const Matrix<Index,Dynamic,1> > innerNonZeros() const { return Eigen::Map<const Matrix<Index,Dynamic,1> >(m_innerNonZeros, m_innerNonZeros?m_outerSize:0); }
@@ -105,17 +105,15 @@ class SparseMatrix
     
     inline bool compressed() const { return m_innerNonZeros==0; }
 
+    /** \returns the number of rows of the matrix */
     inline Index rows() const { return IsRowMajor ? m_outerSize : m_innerSize; }
+    /** \returns the number of columns of the matrix */
     inline Index cols() const { return IsRowMajor ? m_innerSize : m_outerSize; }
 
+    /** \returns the number of rows (resp. columns) of the matrix if the storage order column major (resp. row major) */
     inline Index innerSize() const { return m_innerSize; }
+    /** \returns the number of columns (resp. rows) of the matrix if the storage order column major (resp. row major) */
     inline Index outerSize() const { return m_outerSize; }
-    /** \returns the number of non zeros in the inner vector \a j
-      */
-    inline Index innerNonZeros(Index j) const
-    {
-      return m_innerNonZeros ? m_innerNonZeros[j] : m_outerIndex[j+1]-m_outerIndex[j];
-    }
     
     /** \internal
       * \returns a const pointer to the array of values */
diff --git a/Eigen/src/SparseCore/SparseVector.h b/Eigen/src/SparseCore/SparseVector.h
index 39fbb4c92..d29714b03 100644
--- a/Eigen/src/SparseCore/SparseVector.h
+++ b/Eigen/src/SparseCore/SparseVector.h
@@ -79,11 +79,11 @@ class SparseVector
       Options = _Options
     };
 
-    CompressedStorage<Scalar,Index> m_data;
+    internal::CompressedStorage<Scalar,Index> m_data;
     Index m_size;
 
-    CompressedStorage<Scalar,Index>& _data() { return m_data; }
-    CompressedStorage<Scalar,Index>& _data() const { return m_data; }
+    internal::CompressedStorage<Scalar,Index>& _data() { return m_data; }
+    internal::CompressedStorage<Scalar,Index>& _data() const { return m_data; }
 
   public:
 
@@ -91,7 +91,6 @@ class SparseVector
     EIGEN_STRONG_INLINE Index cols() const { return IsColVector ? 1 : m_size; }
     EIGEN_STRONG_INLINE Index innerSize() const { return m_size; }
     EIGEN_STRONG_INLINE Index outerSize() const { return 1; }
-    EIGEN_STRONG_INLINE Index innerNonZeros(Index j) const { eigen_assert(j==0); return m_size; }
 
     EIGEN_STRONG_INLINE const Scalar* _valuePtr() const { return &m_data.value(0); }
     EIGEN_STRONG_INLINE Scalar* _valuePtr() { return &m_data.value(0); }
@@ -330,7 +329,7 @@ class SparseVector<Scalar,_Options,_Index>::InnerIterator
       eigen_assert(outer==0);
     }
 
-    InnerIterator(const CompressedStorage<Scalar,Index>& data)
+    InnerIterator(const internal::CompressedStorage<Scalar,Index>& data)
       : m_data(data), m_id(0), m_end(static_cast<Index>(m_data.size()))
     {}
 
@@ -351,7 +350,7 @@ class SparseVector<Scalar,_Options,_Index>::InnerIterator
     inline operator bool() const { return (m_id < m_end); }
 
   protected:
-    const CompressedStorage<Scalar,Index>& m_data;
+    const internal::CompressedStorage<Scalar,Index>& m_data;
     Index m_id;
     const Index m_end;
 };
diff --git a/unsupported/Eigen/src/SparseExtra/DynamicSparseMatrix.h b/unsupported/Eigen/src/SparseExtra/DynamicSparseMatrix.h
index 9a61ddb09..ce39a17f7 100644
--- a/unsupported/Eigen/src/SparseExtra/DynamicSparseMatrix.h
+++ b/unsupported/Eigen/src/SparseExtra/DynamicSparseMatrix.h
@@ -86,7 +86,7 @@ template<typename _Scalar, int _Options, typename _Index>
     typedef DynamicSparseMatrix<Scalar,(Flags&~RowMajorBit)|(IsRowMajor?RowMajorBit:0)> TransposedSparseMatrix;
 
     Index m_innerSize;
-    std::vector<CompressedStorage<Scalar,Index> > m_data;
+    std::vector<internal::CompressedStorage<Scalar,Index> > m_data;
 
   public:
 
@@ -96,8 +96,8 @@ template<typename _Scalar, int _Options, typename _Index>
     inline Index outerSize() const { return static_cast<Index>(m_data.size()); }
     inline Index innerNonZeros(Index j) const { return m_data[j].size(); }
 
-    std::vector<CompressedStorage<Scalar,Index> >& _data() { return m_data; }
-    const std::vector<CompressedStorage<Scalar,Index> >& _data() const { return m_data; }
+    std::vector<internal::CompressedStorage<Scalar,Index> >& _data() { return m_data; }
+    const std::vector<internal::CompressedStorage<Scalar,Index> >& _data() const { return m_data; }
 
     /** \returns the coefficient value at given position \a row, \a col
       * This operation involes a log(rho*outer_size) binary search.
diff --git a/unsupported/Eigen/src/SparseExtra/SparseLLT.h b/unsupported/Eigen/src/SparseExtra/SparseLLT.h
index 8ae116e82..fbfeecc35 100644
--- a/unsupported/Eigen/src/SparseExtra/SparseLLT.h
+++ b/unsupported/Eigen/src/SparseExtra/SparseLLT.h
@@ -177,7 +177,7 @@ void SparseLLT<_MatrixType,Backend>::compute(const _MatrixType& a)
   m_matrix.resize(size, size);
 
   // allocate a temporary vector for accumulations
-  AmbiVector<Scalar,Index> tempVector(size);
+  internal::AmbiVector<Scalar,Index> tempVector(size);
   RealScalar density = a.nonZeros()/RealScalar(size*size);
 
   // TODO estimate the number of non zeros
@@ -222,7 +222,7 @@ void SparseLLT<_MatrixType,Backend>::compute(const _MatrixType& a)
     RealScalar rx = internal::sqrt(internal::real(x));
     m_matrix.insert(j,j) = rx; // FIXME use insertBack
     Scalar y = Scalar(1)/rx;
-    for (typename AmbiVector<Scalar,Index>::Iterator it(tempVector, m_precision*rx); it; ++it)
+    for (typename internal::AmbiVector<Scalar,Index>::Iterator it(tempVector, m_precision*rx); it; ++it)
     {
       // FIXME use insertBack
       m_matrix.insertBack(it.index(), j) = it.value() * y;