diff --git a/CHANGELOG.md b/CHANGELOG.md
index f7d2104..975421d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,10 +5,17 @@ Changelog for NeoFS Monitor
 
 ### Changed
 - Usage of Locode DB Go package (#100)
+- Configuration supports only one chain in a moment (#103)
 
 ### Removed
 - Locode DB configuration options (#100)
 
+### Upgrading from v0.9.5
+
+The configuration sections `mainnet` and  `morph` were replaced with similar `chain` sections. To choice between
+main (Neo) chain and side (NeoFS) chain, use `chain.fschain` option. If true, monitor connects to the NeoFS chain,
+otherwise, to the Neo chain.
+
 ## [0.9.5] - 2022-12-29
 
 ### Changed