diff --git a/CHANGELOG_PENDING.md b/CHANGELOG_PENDING.md
index 2c70ee5a..f7fad0d5 100644
--- a/CHANGELOG_PENDING.md
+++ b/CHANGELOG_PENDING.md
@@ -7,6 +7,7 @@ Special thanks to external contributors on this release:
 ### BREAKING CHANGES:
 
 * CLI/RPC/Config
+- [httpclient] Update Subscribe interface to reflect new pubsub/eventBus API [ADR-33](https://github.com/tendermint/tendermint/blob/develop/docs/architecture/adr-033-pubsub.md)
 
 * Apps
 
@@ -30,3 +31,4 @@ Special thanks to external contributors on this release:
 - [p2p] \#3232 Fix infinite loop leading to addrbook deadlock for seed nodes
 - [p2p] \#3247 Fix panic in SeedMode when calling FlushStop and OnStop
   concurrently
+- [libs/pubsub] \#951, \#1880 use non-blocking send when dispatching messages [ADR-33](https://github.com/tendermint/tendermint/blob/develop/docs/architecture/adr-033-pubsub.md)