diff --git a/CHANGELOG.d/1.4.0-current-event-lineage-node.md b/CHANGELOG.d/1.4.0-current-event-lineage-node.md
new file mode 100644
index 000000000..a41cb4129
--- /dev/null
+++ b/CHANGELOG.d/1.4.0-current-event-lineage-node.md
@@ -0,0 +1,4 @@
+# 1.4.0 Current Event Lineage node
+
+Open Public post from the landed Demo Corp members and the popup Event
+Lineage DAG marks that post current. The home DAG does not.
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5e98c688b..8a0f85648 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,15 @@ All notable changes to this project are documented here. Format follows
 [Keep a Changelog](https://keepachangelog.com/en/1.1.0/); versioning follows
 [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [1.4.0] - 2026-08-17
+
+### Added
+
+- Opening Public post from the landed Demo Corp members marks that
+  post current in the popup Event Lineage DAG, so the focused heading
+  has a you-are-here node. The home DAG stays unmarked. No TEPP theta
+  is invented. No cutoff body is invented (ADR 0016).
+
 ## [1.3.0] - 2026-08-17
 
 ### Added
diff --git a/frontend/package.json b/frontend/package.json
index 0361d7c2b..c29108ea1 100644
--- a/frontend/package.json
+++ b/frontend/package.json
@@ -1,7 +1,7 @@
 {
   "name": "frontend",
   "private": true,
-  "version": "1.3.0",
+  "version": "1.4.0",
   "type": "module",
   "scripts": {
     "dev": "vite",
diff --git a/frontend/src/App.css b/frontend/src/App.css
index d43b5d75f..78fced0e0 100644
--- a/frontend/src/App.css
+++ b/frontend/src/App.css
@@ -283,6 +283,11 @@
   stroke-width: 2.5;
 }
 
+.lineage-dag-node[aria-current="true"] circle {
+  stroke-width: 3;
+  stroke: canvastext;
+}
+
 .keyman-list {
   list-style: none;
   padding: 0;
diff --git a/frontend/src/App.test.tsx b/frontend/src/App.test.tsx
index 5aa1b02dd..f96a80009 100644
--- a/frontend/src/App.test.tsx
+++ b/frontend/src/App.test.tsx
@@ -2266,6 +2266,16 @@ describe("App, authenticated", () => {
         screen.getAllByRole("heading", { name: "Event Lineage" }).length,
       ).toBeGreaterThanOrEqual(2);
       expect(document.getElementById("post-event-lineage")).toHaveFocus();
+      const popup = document.querySelector(".popup-panel");
+      expect(popup).not.toBeNull();
+      expect(within(popup as HTMLElement).getByLabelText("Open post: Public post")).toHaveAttribute(
+        "aria-current",
+        "true",
+      );
+      const homeNode = screen
+        .getAllByLabelText("Open post: Public post")
+        .find((node) => !popup?.contains(node));
+      expect(homeNode).not.toHaveAttribute("aria-current");
     } finally {
       HTMLElement.prototype.scrollIntoView = originalScrollIntoView;
     }
diff --git a/frontend/src/App.tsx b/frontend/src/App.tsx
index ce0f8a08a..81f2173b8 100644
--- a/frontend/src/App.tsx
+++ b/frontend/src/App.tsx
@@ -303,7 +303,7 @@ function EventLineageSection({
   return (
     <>
       {scoped.nodes.length > 0 && onSelectPost && (
-        <LineageDag graph={scoped} onSelectPost={onSelectPost} />
+        <LineageDag graph={scoped} onSelectPost={onSelectPost} currentPostId={postId} />
       )}
       {hasLinks && (
         <ul className="lineage-list">
diff --git a/frontend/src/LineageDag.tsx b/frontend/src/LineageDag.tsx
index a4b296a9a..c0398b3aa 100644
--- a/frontend/src/LineageDag.tsx
+++ b/frontend/src/LineageDag.tsx
@@ -8,9 +8,11 @@ function truncateLabel(label: string): string {
 export function LineageDag({
   graph,
   onSelectPost,
+  currentPostId,
 }: {
   graph: LineageGraph;
   onSelectPost: (postId: string) => void;
+  currentPostId?: string;
 }) {
   const groups = layoutLineageDag(graph);
   if (graph.nodes.length === 0) {
@@ -50,6 +52,7 @@ export function LineageDag({
               })}
               {group.nodes.map((node) => {
                 const kind = node.is_branch_point ? "branch" : node.is_root ? "root" : "node";
+                const isCurrent = node.id === currentPostId;
                 return (
                   <g
                     key={node.id}
@@ -58,6 +61,7 @@ export function LineageDag({
                     role="button"
                     tabIndex={0}
                     aria-label={`Open post: ${node.label}`}
+                    aria-current={isCurrent ? "true" : undefined}
                     onClick={() => onSelectPost(node.id)}
                     onKeyDown={(event) => {
                       if (event.key === "Enter" || event.key === " ") {
diff --git a/lineageweave/__init__.py b/lineageweave/__init__.py
index 595ce60bf..1658144d4 100644
--- a/lineageweave/__init__.py
+++ b/lineageweave/__init__.py
@@ -55,4 +55,4 @@
     "sentence_excerpts",
 ]
 
-__version__ = "1.3.0"
+__version__ = "1.4.0"
diff --git a/pyproject.toml b/pyproject.toml
index f346811ae..5f7b01225 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "lineageweave"
-version = "1.3.0"
+version = "1.4.0"
 description = "Reconstructs git-branch-style lineage DAGs from scattered short records using multi-channel score fusion and LLM adjudication."
 readme = "README.md"
 license = { text = "MIT" }
diff --git a/uv.lock b/uv.lock
index ff19ac892..848abc537 100644
--- a/uv.lock
+++ b/uv.lock
@@ -454,7 +454,7 @@ wheels = [
 
 [[package]]
 name = "lineageweave"
-version = "1.3.0"
+version = "1.4.0"
 source = { virtual = "." }
 dependencies = [
     { name = "certifi" },