diff --git a/storage/storage-handle.hpp b/storage/storage-handle.hpp
index 48359d4..767db6f 100644
--- a/storage/storage-handle.hpp
+++ b/storage/storage-handle.hpp
@@ -32,8 +32,8 @@
 using std::string;
 using boost::noncopyable;
 
-/**   
- * @brief this class defines handles to read, insert and delete data packets in storage media
+/**
+ * @brief this class defines handles to read, insert and delete data packets in storage media
  */
 
 class StorageHandle : noncopyable
@@ -101,6 +101,12 @@
   virtual bool
   readNameAny(const Name& name, const Selectors& selectors, vector<Name>& names) = 0;
 
+  /**
+   * @brief Get the number of Data packets stored
+   */
+  virtual size_t
+  size() = 0;
+
 private:
   StorageMethod m_storageMethod;
 };