diff --git a/src/lean_spec/subspecs/containers/__init__.py b/src/lean_spec/subspecs/containers/__init__.py
index 4a269a68..99c13150 100644
--- a/src/lean_spec/subspecs/containers/__init__.py
+++ b/src/lean_spec/subspecs/containers/__init__.py
@@ -10,6 +10,7 @@
 
 from .attestation import (
     AggregatedAttestation,
+    AggregationBits,
     Attestation,
     AttestationData,
     SignedAggregatedAttestation,
@@ -30,6 +31,7 @@
 
 __all__ = [
     "AggregatedAttestation",
+    "AggregationBits",
     "Attestation",
     "AttestationData",
     "Block",
diff --git a/src/lean_spec/subspecs/containers/attestation/attestation.py b/src/lean_spec/subspecs/containers/attestation/attestation.py
index 683310f7..092e355b 100644
--- a/src/lean_spec/subspecs/containers/attestation/attestation.py
+++ b/src/lean_spec/subspecs/containers/attestation/attestation.py
@@ -8,8 +8,7 @@
 - What is already justified (source)
 - What should be justified next (target)
 
-Attestations can be aggregated to save space, but the current specification
-doesn't do this yet.
+Attestations can be aggregated by common data to save space and bandwidth.
 """
 
 from __future__ import annotations