Add new replay system cdxj features

README.rst

@@ -91,7 +91,14 @@ A CDXJ index can also be provided and used by the ipwb replay system by specifyi
 .. code-block:: bash
 
       $ ipwb replay <path/to/cdxj>
-	  
+
+ipwb also supports using an IPFS hash or any HTTP location as the source of the CDXJ:
+
+.. code-block:: bash
+
+      $ ipwb replay http://myDomain/files/myIndex.cdxj
+      $ ipwb replay QmYwAPJzv5CZsnANOTaREALhashYgPpHdWEz79ojWnPbdG
+
 Once started, the replay system's web interface can be accessed through a web browser, e.g., `http://127.0.0.1:5000/http://www.cs.odu.edu/~salam/` with the sample CDXJ file.
 
 .. (TODO: provide instructions on specifying a CDXJ file/directory to be read from the CDXJ replay system)