diff --git a/FAQ.md b/FAQ.md
index fd6224b..3bb1f52 100644
--- a/FAQ.md
+++ b/FAQ.md
@@ -44,4 +44,6 @@ A post will be shared with someone if all of these conditions are fullfilled:
 1. both of you subscribe to the forum/group/blog where the message was posted, and
 1. both of you have chosen to let the other one know that you subscribe (by inviting the other one to join the forum/group/blog, or accepting an invitation from the other one).
 
-When the other person receives the post, they apply the same rules to share it with their own contacts, and so on across the social graph.
\ No newline at end of file
+When the other person receives the post, they apply the same rules to share it with their own contacts, and so on across the social graph.
+
+In more technical terms, each forum/group/blog has a distribution graph where the nodes are subscribers and the edges are a subset of contact relationships (specifically, the subset that have chosen to reveal the subscription to each other).
\ No newline at end of file