diff --git a/templates/run_details.html b/templates/run_details.html
index ed0bd72..8102ea2 100644
--- a/templates/run_details.html
+++ b/templates/run_details.html
@@ -108,6 +108,28 @@
     </div>
 </div>
 
+<!-- Tags -->
+<div class="mb-3 d-flex align-items-center gap-2 flex-wrap">
+    {% if run.tags %}
+        {% for tag in run.tags.split(',') %}
+            <span class="badge bg-secondary fs-6">{{ tag }}</span>
+        {% endfor %}
+    {% else %}
+        <span class="text-muted small fst-italic">No tags</span>
+    {% endif %}
+    <button class="btn btn-sm btn-outline-secondary" data-bs-toggle="collapse" data-bs-target="#tagsForm">
+        <i class="fas fa-tag me-1"></i>Edit Tags
+    </button>
+    <div class="collapse w-100" id="tagsForm">
+        <form action="{{ url_for('run.set_tags', id=run.id) }}" method="POST" class="d-flex gap-2 mt-1">
+            <input type="text" name="tags" class="form-control form-control-sm"
+                   value="{{ run.tags or '' }}"
+                   placeholder="comma-separated tags, e.g. dark-ending, v2, favourite">
+            <button type="submit" class="btn btn-sm btn-primary">Save</button>
+        </form>
+    </div>
+</div>
+
 <!-- Status Bar -->
 <div class="card shadow-sm mb-4">
     <div class="card-body">
diff --git a/web/app.py b/web/app.py
index 1039b20..1923a1b 100644
--- a/web/app.py
+++ b/web/app.py
@@ -116,6 +116,14 @@ with app.app_context():
             _log("System: Added 'last_heartbeat' column to Run table.")
     except: pass
 
+    # Migration: Add 'tags' column if missing
+    try:
+        with db.engine.connect() as conn:
+            conn.execute(text("ALTER TABLE run ADD COLUMN tags VARCHAR(300)"))
+            conn.commit()
+            _log("System: Added 'tags' column to Run table.")
+    except: pass
+
     # Reset all non-terminal runs on startup (running, queued, interrupted)
     # The Huey consumer restarts with the app, so any in-flight tasks are gone.
     try:
diff --git a/web/db.py b/web/db.py
index cc761b7..49da570 100644
--- a/web/db.py
+++ b/web/db.py
@@ -35,6 +35,8 @@ class Run(db.Model):
     progress = db.Column(db.Integer, default=0)
     last_heartbeat = db.Column(db.DateTime, nullable=True)
 
+    tags = db.Column(db.String(300), nullable=True)
+
     logs = db.relationship('LogEntry', backref='run', lazy=True, cascade="all, delete-orphan")
 
     def duration(self):
diff --git a/web/routes/run.py b/web/routes/run.py
index 51d5357..fdd7118 100644
--- a/web/routes/run.py
+++ b/web/routes/run.py
@@ -394,6 +394,22 @@ def revise_book(run_id, book_folder):
     return redirect(url_for('run.view_run', id=new_run.id))
 
 
+@run_bp.route('/run/<int:id>/set_tags', methods=['POST'])
+@login_required
+def set_tags(id):
+    run = db.session.get(Run, id)
+    if not run: return "Run not found", 404
+    if run.project.user_id != current_user.id: return "Unauthorized", 403
+
+    raw = request.form.get('tags', '')
+    tags = [t.strip() for t in raw.split(',') if t.strip()]
+    run.tags = ','.join(dict.fromkeys(tags))
+    db.session.commit()
+
+    flash("Tags updated.")
+    return redirect(url_for('run.view_run', id=id))
+
+
 @run_bp.route('/run/<int:id>/delete', methods=['POST'])
 @login_required
 def delete_run(id):