diff --git a/agora pkg chapter.md b/agora pkg chapter.md
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@@ -185,7 +185,8 @@ Bridges are useful in that they lower friction for users to move across tools an
 Bridges are the main tool we have to enact [[counter anti disintermediation]] and push back against [[walled gardens]]. An Agora tries to provide useful bridges to the community as a public service.
 
 ## Siphons
-A [[siphon]] can be seen as a bridge across which [[flow]] can take place after some initial [[effort]], with cost-benefit ideally following a Pareto-like distribution. Siphons can be specialized to perform pro social [[adversarial interoperability]].
+
+A [[siphon]] can be seen as a bridge across which [[flow]] happens efficiently after some initial [[effort]], with cost-benefit often following a Pareto-like 20-80 distribution. Many Agora siphons are specialized to perform pro social [[adversarial interoperability]].
 
 An example siphon would be a bridge with a one-time setup cost (e.g. an end user having to set up an API key for a walled garden) but which can then be run continuously afterwards at low cost (of maintenance on behalf of the user, and of computation).