diff --git a/docs/proposed/http-storage-node-protocol.rst b/docs/proposed/http-storage-node-protocol.rst
index 5e46480d3..c2a68b3ee 100644
--- a/docs/proposed/http-storage-node-protocol.rst
+++ b/docs/proposed/http-storage-node-protocol.rst
@@ -39,7 +39,10 @@ Tahoe pays a substantial price:
 * The Foolscap developer community is very small.
   The implementation therefore advances very little and some non-trivial part of the maintenance cost falls on the Tahoe project.
 * The extensible serialization system imposes substantial overhead for the simple data structures Tahoe exchanges.
-  Tahoe therefore presents a more sluggish experience to users and taxes servers more greatly than is necessary.
+* Foolscap encourages a "remote object" style of protocol design with involves many client-server interactions.
+  However, Foolscap does not implement "promise pipelining".
+  The result is that Foolscap encourages a protocol that requires many round-trips between client and server.
+* The serialization overhead combined with the many round-trips result in Tahoe presenting a more sluggish experience to users and taxes servers more greatly than is necessary.
 
 HTTP
 ~~~~