diff --git a/src/Core/ZB.MOM.WW.OtOpcUa.Commons/Messages/Alerts/AlarmTransitionEvent.cs b/src/Core/ZB.MOM.WW.OtOpcUa.Commons/Messages/Alerts/AlarmTransitionEvent.cs
index 53bb6ed4..ba1a8f71 100644
--- a/src/Core/ZB.MOM.WW.OtOpcUa.Commons/Messages/Alerts/AlarmTransitionEvent.cs
+++ b/src/Core/ZB.MOM.WW.OtOpcUa.Commons/Messages/Alerts/AlarmTransitionEvent.cs
@@ -14,6 +14,8 @@ namespace ZB.MOM.WW.OtOpcUa.Commons.Messages.Alerts;
 /// <param name="Message">Fully-rendered message text — template tokens already resolved.</param>
 /// <param name="User">Operator who triggered the transition. "system" for engine-driven events.</param>
 /// <param name="TimestampUtc">When the transition occurred.</param>
+/// <param name="AlarmTypeName">OPC UA Part 9 condition subtype name — one of <c>LimitAlarm</c> / <c>DiscreteAlarm</c> / <c>OffNormalAlarm</c> / <c>AlarmCondition</c> (the base type, used as the default). The historian feed maps this onto the durable alarm-type column.</param>
+/// <param name="Comment">Operator-supplied comment on ack / confirm / comment transitions; <c>null</c> for engine-driven transitions (Activated / Cleared / Shelved / …) that carry no comment.</param>
 public sealed record AlarmTransitionEvent(
     string AlarmId,
     string EquipmentPath,
@@ -22,4 +24,6 @@ public sealed record AlarmTransitionEvent(
     int Severity,
     string Message,
     string User,
-    DateTime TimestampUtc);
+    DateTime TimestampUtc,
+    string AlarmTypeName = "AlarmCondition",
+    string? Comment = null);
diff --git a/src/Core/ZB.MOM.WW.OtOpcUa.Core.ScriptedAlarms/ScriptedAlarmEngine.cs b/src/Core/ZB.MOM.WW.OtOpcUa.Core.ScriptedAlarms/ScriptedAlarmEngine.cs
index 700ec0bc..0067f03f 100644
--- a/src/Core/ZB.MOM.WW.OtOpcUa.Core.ScriptedAlarms/ScriptedAlarmEngine.cs
+++ b/src/Core/ZB.MOM.WW.OtOpcUa.Core.ScriptedAlarms/ScriptedAlarmEngine.cs
@@ -598,7 +598,17 @@ public sealed class ScriptedAlarmEngine : IDisposable
             Message: message,
             Condition: condition,
             Emission: kind,
-            TimestampUtc: _clock());
+            TimestampUtc: _clock(),
+            // Operator comment rides along on comment-bearing transitions — the condition
+            // state already carries it. Engine-driven transitions (Activated/Cleared/Shelved/…)
+            // and shelve ops (no comment param) leave it null.
+            Comment: kind switch
+            {
+                EmissionKind.Acknowledged => condition.LastAckComment,
+                EmissionKind.Confirmed => condition.LastConfirmComment,
+                EmissionKind.CommentAdded => condition.Comments.Count == 0 ? null : condition.Comments[^1].Text,
+                _ => null,
+            });
     }
 
     /// <summary>
@@ -823,7 +833,8 @@ public sealed record ScriptedAlarmEvent(
     string Message,
     AlarmConditionState Condition,
     EmissionKind Emission,
-    DateTime TimestampUtc);
+    DateTime TimestampUtc,
+    string? Comment = null);
 
 /// <summary>
 ///     Upstream source abstraction — intentionally identical shape to the virtual-tag
diff --git a/src/Server/ZB.MOM.WW.OtOpcUa.Runtime/ScriptedAlarms/ScriptedAlarmHostActor.cs b/src/Server/ZB.MOM.WW.OtOpcUa.Runtime/ScriptedAlarms/ScriptedAlarmHostActor.cs
index 94e49d51..44091b70 100644
--- a/src/Server/ZB.MOM.WW.OtOpcUa.Runtime/ScriptedAlarms/ScriptedAlarmHostActor.cs
+++ b/src/Server/ZB.MOM.WW.OtOpcUa.Runtime/ScriptedAlarms/ScriptedAlarmHostActor.cs
@@ -294,7 +294,11 @@ public sealed class ScriptedAlarmHostActor : ReceiveActor
             Severity: SeverityToInt(e.Severity),
             Message: e.Message,
             User: TransitionUser(e),
-            TimestampUtc: e.TimestampUtc);
+            TimestampUtc: e.TimestampUtc,
+            // Historian feed prep: carry the Part-9 subtype name (e.Kind.ToString() yields
+            // LimitAlarm/DiscreteAlarm/OffNormalAlarm/AlarmCondition) + any operator comment.
+            AlarmTypeName: e.Kind.ToString(),
+            Comment: e.Comment);
 
         // Warm-standby dedup: only the Primary (driver-role leader) publishes the cluster-wide
         // transition. Default-emit until told we are Secondary/Detached so single-node deploys + the
diff --git a/tests/Core/ZB.MOM.WW.OtOpcUa.Core.ScriptedAlarms.Tests/ScriptedAlarmEngineTests.cs b/tests/Core/ZB.MOM.WW.OtOpcUa.Core.ScriptedAlarms.Tests/ScriptedAlarmEngineTests.cs
index 217e7944..2236e7bf 100644
--- a/tests/Core/ZB.MOM.WW.OtOpcUa.Core.ScriptedAlarms.Tests/ScriptedAlarmEngineTests.cs
+++ b/tests/Core/ZB.MOM.WW.OtOpcUa.Core.ScriptedAlarms.Tests/ScriptedAlarmEngineTests.cs
@@ -448,6 +448,37 @@ public sealed class ScriptedAlarmEngineTests
         persisted!.Confirmed.ShouldBe(AlarmConfirmedState.Confirmed);
     }
 
+    /// <summary>Verifies the emitted <see cref="ScriptedAlarmEvent.Comment"/> carries the operator's
+    /// ack comment on the Acknowledged emission while the earlier Activated emission has no comment,
+    /// and that an explicit AddComment emission carries the comment text. (historian feed prep)</summary>
+    [Fact]
+    public async Task Emission_carries_operator_Comment_on_ack_and_add_comment()
+    {
+        var up = new FakeUpstream();
+        up.Set("Temp", 50);
+        using var eng = Build(up, out _);
+        await eng.LoadAsync([Alarm("HighTemp", """return (int)ctx.GetTag("Temp").Value > 100;""")],
+            TestContext.Current.CancellationToken);
+
+        var events = new List<ScriptedAlarmEvent>();
+        eng.OnEvent += (_, e) => events.Add(e);
+
+        // Activate → Acknowledge(comment) → AddComment(text).
+        up.Push("Temp", 150);
+        await WaitForAsync(() => events.Any(e => e.Emission == EmissionKind.Activated));
+        await eng.AcknowledgeAsync("HighTemp", "op1", "looking into it", TestContext.Current.CancellationToken);
+        await WaitForAsync(() => events.Any(e => e.Emission == EmissionKind.Acknowledged));
+        await eng.AddCommentAsync("HighTemp", "op2", "second look", TestContext.Current.CancellationToken);
+        await WaitForAsync(() => events.Any(e => e.Emission == EmissionKind.CommentAdded));
+
+        // Engine-driven Activated emission carries no operator comment.
+        events.First(e => e.Emission == EmissionKind.Activated).Comment.ShouldBeNull();
+        // Acknowledged emission carries the ack comment.
+        events.First(e => e.Emission == EmissionKind.Acknowledged).Comment.ShouldBe("looking into it");
+        // CommentAdded emission carries the latest appended comment text.
+        events.First(e => e.Emission == EmissionKind.CommentAdded).Comment.ShouldBe("second look");
+    }
+
     // (2b) TimedShelveAsync / UnshelveAsync end-to-end through the engine.
     /// <summary>Verifies that TimedShelveAsync shelves with a deadline and UnshelveAsync removes the shelve before the timer expires.</summary>
     [Fact]
diff --git a/tests/Server/ZB.MOM.WW.OtOpcUa.Runtime.Tests/ScriptedAlarms/ScriptedAlarmHostActorTests.cs b/tests/Server/ZB.MOM.WW.OtOpcUa.Runtime.Tests/ScriptedAlarms/ScriptedAlarmHostActorTests.cs
index 64c373ce..34bee4ca 100644
--- a/tests/Server/ZB.MOM.WW.OtOpcUa.Runtime.Tests/ScriptedAlarms/ScriptedAlarmHostActorTests.cs
+++ b/tests/Server/ZB.MOM.WW.OtOpcUa.Runtime.Tests/ScriptedAlarms/ScriptedAlarmHostActorTests.cs
@@ -173,6 +173,10 @@ public sealed class ScriptedAlarmHostActorTests : RuntimeActorTestBase
         evt.TransitionKind.ShouldBe("Activated");
         evt.Severity.ShouldBe(1000); // 800 → Critical bucket → 1000
         evt.User.ShouldBe("system");
+        // Historian feed prep: the Part-9 subtype rides along (Plan's AlarmType "AlarmCondition"
+        // parses to AlarmKind.AlarmCondition); an engine-driven Activated transition has no comment.
+        evt.AlarmTypeName.ShouldBe("AlarmCondition");
+        evt.Comment.ShouldBeNull();
     }
 
     /// <summary>Clear path: after activating, pushing a value below the threshold drives Active→Inactive
@@ -306,6 +310,9 @@ public sealed class ScriptedAlarmHostActorTests : RuntimeActorTestBase
         var evt = alerts.FishForMessage<AlarmTransitionEvent>(e => e.TransitionKind == "Acknowledged", Timeout);
         evt.AlarmId.ShouldBe("alm-1");
         evt.User.ShouldBe("alice");
+        // Historian feed prep: the operator's ack comment threads through to the transition event.
+        evt.Comment.ShouldBe("ack-note");
+        evt.AlarmTypeName.ShouldBe("AlarmCondition");
     }
 
     /// <summary>Ownership filter: an AlarmCommand for an AlarmId this host's engine does NOT own is ignored