diff --git a/gen/jsonschema/schemas/Artifact.schema.json b/gen/jsonschema/schemas/Artifact.schema.json
index 49263fcd..635e1233 100644
--- a/gen/jsonschema/schemas/Artifact.schema.json
+++ b/gen/jsonschema/schemas/Artifact.schema.json
@@ -17,7 +17,7 @@
                 "artifactDigest": {
                     "$ref": "#/definitions/dev.sigstore.common.v1.HashOutput",
                     "additionalProperties": false,
-                    "description": "Digest of the artifact"
+                    "description": "Digest of the artifact. SHOULD NOT be used when verifying an in-toto attestation as the subject digest cannot be reconstructed. This option will not work with Ed25519 signatures, use Ed25519Ph or another algorithm instead."
                 }
             },
             "additionalProperties": false,
diff --git a/gen/jsonschema/schemas/Input.schema.json b/gen/jsonschema/schemas/Input.schema.json
index faf0952f..18eaccea 100644
--- a/gen/jsonschema/schemas/Input.schema.json
+++ b/gen/jsonschema/schemas/Input.schema.json
@@ -657,7 +657,7 @@
                 "artifactDigest": {
                     "$ref": "#/definitions/dev.sigstore.common.v1.HashOutput",
                     "additionalProperties": false,
-                    "description": "Digest of the artifact"
+                    "description": "Digest of the artifact. SHOULD NOT be used when verifying an in-toto attestation as the subject digest cannot be reconstructed. This option will not work with Ed25519 signatures, use Ed25519Ph or another algorithm instead."
                 }
             },
             "additionalProperties": false,
diff --git a/gen/pb-go/verification/v1/sigstore_verification.pb.go b/gen/pb-go/verification/v1/sigstore_verification.pb.go
index 59dd7427..1aab1e6d 100644
--- a/gen/pb-go/verification/v1/sigstore_verification.pb.go
+++ b/gen/pb-go/verification/v1/sigstore_verification.pb.go
@@ -444,7 +444,10 @@ type Artifact_Artifact struct {
 }
 
 type Artifact_ArtifactDigest struct {
-	// Digest of the artifact
+	// Digest of the artifact. SHOULD NOT be used when verifying an
+	// in-toto attestation as the subject digest cannot be
+	// reconstructed. This option will not work with Ed25519
+	// signatures, use Ed25519Ph or another algorithm instead.
 	ArtifactDigest *v1.HashOutput `protobuf:"bytes,3,opt,name=artifact_digest,json=artifactDigest,proto3,oneof"`
 }
 
diff --git a/gen/pb-python/sigstore_protobuf_specs/dev/sigstore/verification/v1/__init__.py b/gen/pb-python/sigstore_protobuf_specs/dev/sigstore/verification/v1/__init__.py
index a40f153b..f60d773c 100644
--- a/gen/pb-python/sigstore_protobuf_specs/dev/sigstore/verification/v1/__init__.py
+++ b/gen/pb-python/sigstore_protobuf_specs/dev/sigstore/verification/v1/__init__.py
@@ -185,7 +185,12 @@ class Artifact(betterproto.Message):
     artifact_digest: "__common_v1__.HashOutput" = betterproto.message_field(
         3, group="data"
     )
-    """Digest of the artifact"""
+    """
+    Digest of the artifact. SHOULD NOT be used when verifying an
+     in-toto attestation as the subject digest cannot be
+     reconstructed. This option will not work with Ed25519
+     signatures, use Ed25519Ph or another algorithm instead.
+    """
 
 
 @dataclass(eq=False, repr=False)
diff --git a/gen/pb-rust/sigstore-protobuf-specs/src/generated/dev.sigstore.verification.v1.rs b/gen/pb-rust/sigstore-protobuf-specs/src/generated/dev.sigstore.verification.v1.rs
index 3e739cfa..97df6d89 100644
--- a/gen/pb-rust/sigstore-protobuf-specs/src/generated/dev.sigstore.verification.v1.rs
+++ b/gen/pb-rust/sigstore-protobuf-specs/src/generated/dev.sigstore.verification.v1.rs
@@ -265,7 +265,10 @@ pub mod artifact {
         /// The raw bytes of the artifact
         #[prost(bytes, tag = "2")]
         Artifact(::prost::alloc::vec::Vec<u8>),
-        /// Digest of the artifact
+        /// Digest of the artifact. SHOULD NOT be used when verifying an
+        /// in-toto attestation as the subject digest cannot be
+        /// reconstructed. This option will not work with Ed25519
+        /// signatures, use Ed25519Ph or another algorithm instead.
         #[prost(message, tag = "3")]
         ArtifactDigest(super::super::super::common::v1::HashOutput),
     }
diff --git a/gen/pb-rust/sigstore-protobuf-specs/src/generated/file_descriptor_set.bin b/gen/pb-rust/sigstore-protobuf-specs/src/generated/file_descriptor_set.bin
index 16380f90..1a9c91f2 100644
Binary files a/gen/pb-rust/sigstore-protobuf-specs/src/generated/file_descriptor_set.bin and b/gen/pb-rust/sigstore-protobuf-specs/src/generated/file_descriptor_set.bin differ
diff --git a/protos/sigstore_verification.proto b/protos/sigstore_verification.proto
index c00cbdd9..53b9df1a 100644
--- a/protos/sigstore_verification.proto
+++ b/protos/sigstore_verification.proto
@@ -136,7 +136,10 @@ message Artifact {
                 string artifact_uri = 1;
                 // The raw bytes of the artifact
                 bytes artifact = 2;
-                // Digest of the artifact
+                // Digest of the artifact. SHOULD NOT be used when verifying an
+                // in-toto attestation as the subject digest cannot be
+                // reconstructed. This option will not work with Ed25519
+                // signatures, use Ed25519Ph or another algorithm instead.
                 dev.sigstore.common.v1.HashOutput artifact_digest = 3;
         }
 }