diff --git a/docs/rfc/rfc-003-performance-questions.md b/docs/rfc/rfc-003-performance-questions.md
index 82fac59fc..36d2b0fb3 100644
--- a/docs/rfc/rfc-003-performance-questions.md
+++ b/docs/rfc/rfc-003-performance-questions.md
@@ -236,7 +236,21 @@ of the slowdown in the Cosmos Hub and in Tendermint consensus.
 
 ### Tendermint Event System
 
-// TODO: (@wbanfield)
+The Tendermint Event system is used to communicate and store information about
+internal Tendermint execution. The system uses channels internally to send messages
+to different subscribers. Sending an event [blocks on the internal channel][event-send].
+The default configuration is to [use an unbuffered channel for event publishes][event-buffer-capacity].
+Several consumers of the event system also use an unbuffered channel for reads.
+An example of this is the [event indexer][event-indexer-unbuffered], which takes an
+unbuffered subscription to the event system. The result is that these unbuffered readers
+can cause writes to the event system to block or slow down depending on contention in the
+event system. This has implications for the consensus system, which [publishes events][consensus-event-send].
+To better understand the performance of the event system, we should add metrics to track the timing of
+event sends. The following metrics would be a good start for tracking this performance:
+
+* Time in event send, labeled by Event Type
+* Time in event receive, labeled by subscriber
+* Event throughput, measured in events per unit time.
 
 ### References
 [modular-hashing]: https://github.com/tendermint/tendermint/pull/6773
@@ -249,3 +263,7 @@ of the slowdown in the Cosmos Hub and in Tendermint consensus.
 [abci-local-client-code]: https://github.com/tendermint/tendermint/blob/511bd3eb7f037855a793a27ff4c53c12f085b570/abci/client/local_client.go#L84
 [hub-signature]: https://github.com/cosmos/gaia/blob/0ecb6ed8a244d835807f1ced49217d54a9ca2070/docs/resources/genesis.md#consensus-parameters
 [ed25519-bench]: https://github.com/oasisprotocol/curve25519-voi/blob/d2e7fc59fe38c18ca990c84c4186cba2cc45b1f9/PERFORMANCE.md
+[event-send]: https://github.com/tendermint/tendermint/blob/5bd3b286a2b715737f6d6c33051b69061d38f8ef/libs/pubsub/pubsub.go#L338
+[event-buffer-capacity]: https://github.com/tendermint/tendermint/blob/5bd3b286a2b715737f6d6c33051b69061d38f8ef/types/event_bus.go#L14
+[event-indexer-unbuffered]: https://github.com/tendermint/tendermint/blob/5bd3b286a2b715737f6d6c33051b69061d38f8ef/state/indexer/indexer_service.go#L39
+[consensus-event-send]: https://github.com/tendermint/tendermint/blob/5bd3b286a2b715737f6d6c33051b69061d38f8ef/internal/consensus/state.go#L1573
diff --git a/internal/consensus/state.go b/internal/consensus/state.go
index 6379b71d5..16f2bb0bd 100644
--- a/internal/consensus/state.go
+++ b/internal/consensus/state.go
@@ -137,7 +137,7 @@ type State struct {
 	done chan struct{}
 
 	// synchronous pubsub between consensus state and reactor.
-	// state only emits EventNewRoundStep and EventVote
+	// state only emits EventNewRoundStep, EventValidBlock, and EventVote
 	evsw tmevents.EventSwitch
 
 	// for reporting metrics