Adding more doxygen documentation
diff --git a/model/ccnx-pit-entry-incoming-face.h b/model/ccnx-pit-entry-incoming-face.h
index 80f7e09..61cb4e6 100644
--- a/model/ccnx-pit-entry-incoming-face.h
+++ b/model/ccnx-pit-entry-incoming-face.h
@@ -46,7 +46,14 @@
    */
   CcnxPitEntryIncomingFace (Ptr<CcnxFace> face);
 
+  /**
+   * @brief Compare two CcnxPitEntryIncomingFace
+   */
   bool operator== (const CcnxPitEntryIncomingFace &dst) { return *m_face==*(dst.m_face); }
+
+  /**
+   * @brief Compare CcnxPitEntryIncomingFace with CcnxFace
+   */
   bool operator== (Ptr<CcnxFace> face) { return *m_face==*face; }
 
   /**