diff --git a/docs/protocols/alpha.rst b/docs/protocols/alpha.rst
index a07f7df6a611e1898016b5e65bcacd988095861e..23f3ac2ae51a589bd7e9825255402d96f10fa4ab 100644
--- a/docs/protocols/alpha.rst
+++ b/docs/protocols/alpha.rst
@@ -59,6 +59,12 @@ Data Availability Layer (ongoing)
 
 
 
+- An optional ``dal_attestation`` field is now present in the
+  ``block_metadata`` indicating the attested slots. The slots being
+  attested are the slots that were published ``attestation_lag`` blocks
+  ago (MR :gl:`!11903`) (see `DAL documentation
+  <https://tezos.gitlab.io/shell/dal.html>`_ for more context).
+
 Adaptive Issuance (ongoing)
 ----------------------------
 
diff --git a/src/proto_alpha/lib_protocol/apply_results.ml b/src/proto_alpha/lib_protocol/apply_results.ml
index 9b7ee1634554c34f72668b9f5b45b2278e51de0a..01a77db55e8c02d1a1349b53d453cf11b94c735d 100644
--- a/src/proto_alpha/lib_protocol/apply_results.ml
+++ b/src/proto_alpha/lib_protocol/apply_results.ml
@@ -2840,11 +2840,7 @@ let block_metadata_encoding ~use_legacy_attestation_name =
              (req "proposer_consensus_key" Signature.Public_key_hash.encoding)
              (req "baker_consensus_key" Signature.Public_key_hash.encoding)
              (req "consumed_milligas" Gas.Arith.n_fp_encoding)
-             (* DAL/FIXME https://gitlab.com/tezos/tezos/-/issues/3119
-                This varopt is here while the DAL is behind a feature
-                flag. This should be replaced by a required field once
-                the feature flag will be activated. *)
-             (varopt "dal_attestation" Dal.Attestation.encoding)))
+             (opt "dal_attestation" Dal.Attestation.encoding)))
 
 let block_metadata_encoding_with_legacy_attestation_name =
   block_metadata_encoding ~use_legacy_attestation_name:true