diff --git a/src/node/ns2-mobility-file-topology.cc b/src/node/ns2-mobility-file-topology.cc
index ee44355b9..9845d62f0 100644
--- a/src/node/ns2-mobility-file-topology.cc
+++ b/src/node/ns2-mobility-file-topology.cc
@@ -27,18 +27,18 @@
 #include <fstream>
 #include <sstream>
 
-NS_DEBUG_COMPONENT_DEFINE ("Ns2MobileFileTopology");
+NS_DEBUG_COMPONENT_DEFINE ("Ns2MobilityFileTopology");
 
 namespace ns3 {
 
 
-Ns2MobileFileTopology::Ns2MobileFileTopology (std::string filename)
+Ns2MobilityFileTopology::Ns2MobilityFileTopology (std::string filename)
   : m_filename (filename)
 {}
 
 
 Ptr<StaticSpeedMobilityModel>
-Ns2MobileFileTopology::GetMobilityModel (std::string idString, const ObjectStore &store) const
+Ns2MobilityFileTopology::GetMobilityModel (std::string idString, const ObjectStore &store) const
 {
   std::istringstream iss;
   iss.str (idString);
@@ -60,7 +60,7 @@ Ns2MobileFileTopology::GetMobilityModel (std::string idString, const ObjectStore
 }
 
 double
-Ns2MobileFileTopology::ReadDouble (std::string valueString) const
+Ns2MobilityFileTopology::ReadDouble (std::string valueString) const
 {
   std::istringstream iss;
   iss.str (valueString);
@@ -70,7 +70,7 @@ Ns2MobileFileTopology::ReadDouble (std::string valueString) const
 }
 
 void 
-Ns2MobileFileTopology::LayoutObjectStore (const ObjectStore &store) const
+Ns2MobilityFileTopology::LayoutObjectStore (const ObjectStore &store) const
 {
   std::ifstream file (m_filename.c_str (), std::ios::in);
   if (file.is_open())
@@ -137,7 +137,7 @@ Ns2MobileFileTopology::LayoutObjectStore (const ObjectStore &store) const
 }
 
 void 
-Ns2MobileFileTopology::Layout (void) const
+Ns2MobilityFileTopology::Layout (void) const
 {
   Layout (NodeList::Begin (), NodeList::End ());
 }
diff --git a/src/node/ns2-mobility-file-topology.h b/src/node/ns2-mobility-file-topology.h
index 7d08bad26..1bcc1a5fe 100644
--- a/src/node/ns2-mobility-file-topology.h
+++ b/src/node/ns2-mobility-file-topology.h
@@ -18,8 +18,8 @@
  *
  * Author: Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
  */
-#ifndef NS2_MOBILE_FILE_TOPOLOGY_H
-#define NS2_MOBILE_FILE_TOPOLOGY_H
+#ifndef NS2_MOBILITY_FILE_TOPOLOGY_H
+#define NS2_MOBILITY_FILE_TOPOLOGY_H
 
 #include <string>
 #include <stdint.h>
@@ -29,12 +29,38 @@
 
 namespace ns3 {
 
-class Ns2MobileFileTopology
+/**
+ * \brief a topology object which can read ns2's movement files
+ *        generated by the CMU setdest tool.
+ */
+class Ns2MobilityFileTopology
 {
 public:
-  Ns2MobileFileTopology (std::string filename);
+  /**
+   * \param filename filename of file which contains the
+   *        ns2 movement trace.
+   */
+  Ns2MobilityFileTopology (std::string filename);
 
+  /**
+   * Read the ns2 trace file and configure the movement
+   * patterns of all nodes contained in the global ns3::NodeList
+   * whose nodeId is matches the nodeId of the nodes in the trace
+   * file.
+   */
   void Layout (void) const;
+
+  /**
+   * \param begin an iterator which points to the start of the input
+   *        object array.
+   * \param end an iterator which points to the end of the input
+   *        object array.
+   *
+   * Read the ns2 trace file and configure the movement
+   * patterns of all input objects. Each input object
+   * is identified by a unique node id which reflects
+   * the index of the object in the input array.
+   */
   template <typename T>
   void Layout (T begin, T end) const;
 private:
@@ -56,7 +82,7 @@ namespace ns3 {
 
 template <typename T>
 void 
-Ns2MobileFileTopology::Layout (T begin, T end) const
+Ns2MobilityFileTopology::Layout (T begin, T end) const
 {
   class MyObjectStore : public ObjectStore
   {
@@ -84,4 +110,4 @@ Ns2MobileFileTopology::Layout (T begin, T end) const
 
 } // namespace ns3
 
-#endif /* NS2_MOBILE_FILE_TOPOLOGY_H */
+#endif /* NS2_MOBILITY_FILE_TOPOLOGY_H */
diff --git a/utils/mobility-generator.cc b/utils/mobility-generator.cc
index dc6815ed9..7c7a7159c 100644
--- a/utils/mobility-generator.cc
+++ b/utils/mobility-generator.cc
@@ -54,7 +54,7 @@ int main (int argc, char *argv[])
 			strlen ("--ns2-topology=")) == 0)
 	{
 	  const char *filename = *argv + strlen ("--ns2-topology=");
-	  Ns2MobileFileTopology topology (filename);
+	  Ns2MobilityFileTopology topology (filename);
 	  topology.Layout (objects.begin (), objects.end ());
 	}
       argc--;