diff --git a/gen/jsonschema/schemas/Bundle.schema.json b/gen/jsonschema/schemas/Bundle.schema.json
index 768f9dba..1ecdbdb2 100644
--- a/gen/jsonschema/schemas/Bundle.schema.json
+++ b/gen/jsonschema/schemas/Bundle.schema.json
@@ -314,7 +314,7 @@
                 },
                 "integratedTime": {
                     "type": "string",
-                    "description": "The UNIX timestamp from the log when the entry was persisted."
+                    "description": "The UNIX timestamp from the log when the entry was persisted. The integration time MUST NOT be trusted if inclusion_promise is omitted."
                 },
                 "inclusionPromise": {
                     "$ref": "#/definitions/dev.sigstore.rekor.v1.InclusionPromise",
diff --git a/gen/jsonschema/schemas/Input.schema.json b/gen/jsonschema/schemas/Input.schema.json
index dcfdd4a7..faf0952f 100644
--- a/gen/jsonschema/schemas/Input.schema.json
+++ b/gen/jsonschema/schemas/Input.schema.json
@@ -507,7 +507,7 @@
                 },
                 "integratedTime": {
                     "type": "string",
-                    "description": "The UNIX timestamp from the log when the entry was persisted."
+                    "description": "The UNIX timestamp from the log when the entry was persisted. The integration time MUST NOT be trusted if inclusion_promise is omitted."
                 },
                 "inclusionPromise": {
                     "$ref": "#/definitions/dev.sigstore.rekor.v1.InclusionPromise",
diff --git a/gen/jsonschema/schemas/TransparencyLogEntry.schema.json b/gen/jsonschema/schemas/TransparencyLogEntry.schema.json
index c548f868..69481baa 100644
--- a/gen/jsonschema/schemas/TransparencyLogEntry.schema.json
+++ b/gen/jsonschema/schemas/TransparencyLogEntry.schema.json
@@ -20,7 +20,7 @@
                 },
                 "integratedTime": {
                     "type": "string",
-                    "description": "The UNIX timestamp from the log when the entry was persisted."
+                    "description": "The UNIX timestamp from the log when the entry was persisted. The integration time MUST NOT be trusted if inclusion_promise is omitted."
                 },
                 "inclusionPromise": {
                     "$ref": "#/definitions/dev.sigstore.rekor.v1.InclusionPromise",
diff --git a/gen/jsonschema/schemas/VerificationMaterial.schema.json b/gen/jsonschema/schemas/VerificationMaterial.schema.json
index 14faa461..c95a0d24 100644
--- a/gen/jsonschema/schemas/VerificationMaterial.schema.json
+++ b/gen/jsonschema/schemas/VerificationMaterial.schema.json
@@ -231,7 +231,7 @@
                 },
                 "integratedTime": {
                     "type": "string",
-                    "description": "The UNIX timestamp from the log when the entry was persisted."
+                    "description": "The UNIX timestamp from the log when the entry was persisted. The integration time MUST NOT be trusted if inclusion_promise is omitted."
                 },
                 "inclusionPromise": {
                     "$ref": "#/definitions/dev.sigstore.rekor.v1.InclusionPromise",
diff --git a/gen/pb-go/rekor/v1/sigstore_rekor.pb.go b/gen/pb-go/rekor/v1/sigstore_rekor.pb.go
index ef5efe48..17deda7c 100644
--- a/gen/pb-go/rekor/v1/sigstore_rekor.pb.go
+++ b/gen/pb-go/rekor/v1/sigstore_rekor.pb.go
@@ -323,6 +323,8 @@ type TransparencyLogEntry struct {
 	// verification.
 	KindVersion *KindVersion `protobuf:"bytes,3,opt,name=kind_version,json=kindVersion,proto3" json:"kind_version,omitempty"`
 	// The UNIX timestamp from the log when the entry was persisted.
+	// The integration time MUST NOT be trusted if inclusion_promise
+	// is omitted.
 	IntegratedTime int64 `protobuf:"varint,4,opt,name=integrated_time,json=integratedTime,proto3" json:"integrated_time,omitempty"`
 	// The inclusion promise/signed entry timestamp from the log.
 	// Required for v0.1 bundles, and MUST be verified.
diff --git a/gen/pb-python/sigstore_protobuf_specs/dev/sigstore/rekor/v1/__init__.py b/gen/pb-python/sigstore_protobuf_specs/dev/sigstore/rekor/v1/__init__.py
index e8670943..890d3f79 100644
--- a/gen/pb-python/sigstore_protobuf_specs/dev/sigstore/rekor/v1/__init__.py
+++ b/gen/pb-python/sigstore_protobuf_specs/dev/sigstore/rekor/v1/__init__.py
@@ -123,7 +123,11 @@ class TransparencyLogEntry(betterproto.Message):
     """
 
     integrated_time: int = betterproto.int64_field(4)
-    """The UNIX timestamp from the log when the entry was persisted."""
+    """
+    The UNIX timestamp from the log when the entry was persisted.
+     The integration time MUST NOT be trusted if inclusion_promise
+     is omitted.
+    """
 
     inclusion_promise: "InclusionPromise" = betterproto.message_field(5)
     """
diff --git a/gen/pb-rust/sigstore-protobuf-specs/src/generated/dev.sigstore.rekor.v1.rs b/gen/pb-rust/sigstore-protobuf-specs/src/generated/dev.sigstore.rekor.v1.rs
index 80556e38..a7a950d5 100644
--- a/gen/pb-rust/sigstore-protobuf-specs/src/generated/dev.sigstore.rekor.v1.rs
+++ b/gen/pb-rust/sigstore-protobuf-specs/src/generated/dev.sigstore.rekor.v1.rs
@@ -127,6 +127,8 @@ pub struct TransparencyLogEntry {
     #[prost(message, optional, tag = "3")]
     pub kind_version: ::core::option::Option<KindVersion>,
     /// The UNIX timestamp from the log when the entry was persisted.
+    /// The integration time MUST NOT be trusted if inclusion_promise
+    /// is omitted.
     #[prost(int64, tag = "4")]
     pub integrated_time: i64,
     /// The inclusion promise/signed entry timestamp from the log.
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 76cfb527..16380f90 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/gen/pb-typescript/src/__generated__/sigstore_rekor.ts b/gen/pb-typescript/src/__generated__/sigstore_rekor.ts
index 1e9ab6fa..6bdce16d 100644
--- a/gen/pb-typescript/src/__generated__/sigstore_rekor.ts
+++ b/gen/pb-typescript/src/__generated__/sigstore_rekor.ts
@@ -98,7 +98,11 @@ export interface TransparencyLogEntry {
   kindVersion:
     | KindVersion
     | undefined;
-  /** The UNIX timestamp from the log when the entry was persisted. */
+  /**
+   * The UNIX timestamp from the log when the entry was persisted.
+   * The integration time MUST NOT be trusted if inclusion_promise
+   * is omitted.
+   */
   integratedTime: string;
   /**
    * The inclusion promise/signed entry timestamp from the log.
diff --git a/protos/sigstore_rekor.proto b/protos/sigstore_rekor.proto
index 89159601..57148361 100644
--- a/protos/sigstore_rekor.proto
+++ b/protos/sigstore_rekor.proto
@@ -101,6 +101,8 @@ message TransparencyLogEntry {
         // verification.
         KindVersion kind_version = 3 [(google.api.field_behavior) = REQUIRED];
         // The UNIX timestamp from the log when the entry was persisted.
+        // The integration time MUST NOT be trusted if inclusion_promise
+        // is omitted.
         int64 integrated_time = 4 [(google.api.field_behavior) = REQUIRED];
         // The inclusion promise/signed entry timestamp from the log.
         // Required for v0.1 bundles, and MUST be verified.