diff --git a/specs/electra/beacon-chain.md b/specs/electra/beacon-chain.md
index 341efe335..850215606 100644
--- a/specs/electra/beacon-chain.md
+++ b/specs/electra/beacon-chain.md
@@ -17,7 +17,9 @@
   - [New containers](#new-containers)
     - [`DepositReceipt`](#depositreceipt)
     - [`ExecutionLayerExit`](#executionlayerexit)
-  - [Extended Containers](#extended-containers)
+- [Modified Containers](#modified-containers)
+    - [`AttesterSlashing`](#attesterslashing)
+- [Extended Containers](#extended-containers)
     - [`Attestation`](#attestation)
     - [`IndexedAttestation`](#indexedattestation)
     - [`BeaconBlockBody`](#beaconblockbody)