diff --git a/specs/sharding/beacon-chain.md b/specs/sharding/beacon-chain.md
index a83101af0e..dfb04963ba 100644
--- a/specs/sharding/beacon-chain.md
+++ b/specs/sharding/beacon-chain.md
@@ -19,7 +19,7 @@
   - [Domain types](#domain-types)
 - [Updated containers](#updated-containers)
   - [`AttestationData`](#attestationdata)
-  - [`BeaconBlock`](#beaconblock)
+  - [`BeaconBlockBody`](#beaconblockbody)
   - [`BeaconState`](#beaconstate)
 - [New containers](#new-containers)
   - [`DataCommitment`](#datacommitment)