Add NACK processing
diff --git a/model/ccnx-pit-entry.h b/model/ccnx-pit-entry.h
index 9f05e1e..bb42a6a 100644
--- a/model/ccnx-pit-entry.h
+++ b/model/ccnx-pit-entry.h
@@ -164,6 +164,12 @@
   AddIncoming (Ptr<CcnxFace> face);
 
   /**
+   * @brief Remove incoming entry for face `face`
+   */
+  void
+  RemoveIncoming (Ptr<CcnxFace> face);
+
+  /**
    * @brief Clear all incoming faces either after all of them were satisfied or NACKed
    */
   void