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diff --git a/TODO b/TODO
index 1d06a49..8c37049 100644
--- a/TODO
+++ b/TODO
@@ -1,3 +1,7 @@
+* Leave the prevMessage out of Activity serialization to save BW.
+  Do include it in the data that gets signed, so it can be recovered
+  by trying each likely (recently seen) Activity as the prevMessage, and
+  checking the signature.
 * loadLog should verify the hashes (and signatures) in the log, and
   refuse to use logs that are not valid proofs of a session.
 * Encryption!