diff --git a/networking-flow.md b/networking-flow.md
index daab098..5cb718b 100644
--- a/networking-flow.md
+++ b/networking-flow.md
@@ -32,3 +32,12 @@ vendor/nim-libp2p/libp2p/switch.nim:
   - awaits Switch.upgradeIncoming(Connection)
   - awaits Connection.close()
   - awaits Switch.cleanupConn(Connection)
+- Switch.upgradeIncoming(Connection)
+  - creates a local Multistream instance
+  - awaits Multistream.select(Connection)
+  - for each protocol string key in Switch.secureManagers, calls Multistream.addHandler(proto: string, Switch.upgradeIncoming.securedHandler)
+  - awaits Multistream.handle(Connection)
+- Switch.upgradeIncoming.securedHandler(Connection, proto: string)
+  - awaits Secure.secure(Connection) and saves the result in `sconn` - this seems to be the same as `conn`
+  - for each MuxerProvider value in Switch.muxers, calls Multistream.addHandler(MuxerProvider.codec, MuxerProvider)
+  - awaits Multistream.handle(sconn: Connection)
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