diff --git a/overview.md b/overview.md
index 3a19728..5831971 100644
--- a/overview.md
+++ b/overview.md
@@ -24,12 +24,16 @@ This is a suggested list of how we could organize by topic. Under each topic, we
 #### Network structure
 
 - Federation
+  - Messages passed between systems
+  - Data replicated between systems
 - P2p
+- Hybrid
 
 #### Identity
 
 - Decentralized identity
-- Key management
+- Key verification
+- Key backup
 - Reputation, Trust
 - Account recovery
 - Privacy