diff --git a/specs/custody_game/beacon-chain.md b/specs/custody_game/beacon-chain.md
index 6f9f61cf9..fd00dedda 100644
--- a/specs/custody_game/beacon-chain.md
+++ b/specs/custody_game/beacon-chain.md
@@ -11,7 +11,8 @@
 - [Introduction](#introduction)
 - [Constants](#constants)
   - [Misc](#misc)
-- [Configuration](#configuration)
+  - [Domain types](#domain-types)
+- [Preset](#preset)
   - [Time parameters](#time-parameters)
   - [Max operations per block](#max-operations-per-block)
   - [Size parameters](#size-parameters)