diff --git a/README.md b/README.md
index 6034174..ec056d9 100644
--- a/README.md
+++ b/README.md
@@ -8,6 +8,7 @@ dated video folders into a simple daily view that is easy to search and play.
 - Shows recordings on a full 24-hour timeline.
 - Uses the time in each filename to place clips at the correct time of day.
 - Shows recorded minutes in light blue and empty periods in dark blue.
+- Shows recorder-detected system events in dark yellow when `fileindex.dat` is present.
 - Lets you choose the recording date.
 - Plays browser-friendly MP4 files immediately.
 - Converts an AVI clip automatically when no MP4 copy exists.
diff --git a/index.html b/index.html
index a5d5948..c906dce 100644
--- a/index.html
+++ b/index.html
@@ -70,6 +70,7 @@
     .legend .rec::before { background: var(--accent); }
     .legend .gap::before { background: #2a2a2a; border: 1px solid #444; }
     .legend .highlight::before { background: #ffd43b; }
+    .legend .system::before { background: #a87900; }
     .highlights { margin-top: 18px; background: var(--surface); border-radius: 8px; padding: 14px 16px; }
     .highlights h2 { font-size: 14px; font-weight: 500; margin-bottom: 10px; }
     .highlight-actions { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
@@ -165,7 +166,7 @@
       <canvas id="timeline"></canvas>
     </div>
     <div class="hours" id="hours"></div>
-    <div class="legend"><span class="rec">Recorded</span><span class="highlight">Highlight</span><span class="gap">No recording</span></div>
+    <div class="legend"><span class="rec">Recorded</span><span class="highlight">Highlight</span><span class="system">System highlight</span><span class="gap">No recording</span></div>
   </div>
 
   <section class="highlights">
@@ -203,6 +204,7 @@
   let zoom = 1;
   let focus = 43200;
   let highlights = [];
+  let systemHighlights = [];
   let highlightStart = null;
   let highlightEnd = null;
   let encodingWasRunning = false;
@@ -321,6 +323,11 @@
       list.append(row);
     });
   }
+  async function loadSystemHighlights() {
+    const response = await fetch(`/api/system-highlights?date=${dateSelect.value}`);
+    systemHighlights = await response.json();
+    drawTimeline();
+  }
   document.querySelector("#mark-start").onclick = () => setMark("start");
   document.querySelector("#mark-end").onclick = () => setMark("end");
   document.querySelector("#save-highlight").onclick = async () => {
@@ -403,6 +410,12 @@
       const r = (item.end - winStart) / winSize * w;
       if (r > 0 && l < w) ctx.fillRect(Math.max(0, l), 0, Math.min(w, r) - Math.max(0, l), 56);
     });
+    ctx.fillStyle = "#a87900";
+    systemHighlights.forEach(item => {
+      const l = (item.start - winStart) / winSize * w;
+      const r = (item.end - winStart) / winSize * w;
+      if (r > 0 && l < w) ctx.fillRect(Math.max(0, l), 0, Math.min(w, r) - Math.max(0, l), 56);
+    });
     // hour lines
     ctx.strokeStyle = "rgba(255,255,255,.08)";
     for (let h = Math.ceil(winStart / 3600); h < winEnd / 3600; h++) {
@@ -454,6 +467,7 @@
     scrubFill.style.width = "0%";
     drawTimeline();
     loadHighlights();
+    loadSystemHighlights();
     if (!date && d.dates[0]) loadDate(d.dates[0]);
   }
 
diff --git a/server.py b/server.py
index 070406b..5fdb7fa 100644
--- a/server.py
+++ b/server.py
@@ -4,8 +4,10 @@ import concurrent.futures
 import json
 import re
 import subprocess
+import struct
 import threading
 import os
+from datetime import datetime
 from http.server import BaseHTTPRequestHandler, ThreadingHTTPServer
 from pathlib import Path
 from urllib.parse import parse_qs, urlparse
@@ -63,6 +65,24 @@ def normalize_date(value):
     return date
 
 
+def scan_system_highlights(root):
+    try:
+        data = (root / "fileindex.dat").read_bytes()
+    except OSError:
+        return []
+    highlights = []
+    for offset in range(0, len(data) - 15, 16):
+        timestamp, packed, _, _ = struct.unpack_from("<4I", data, offset)
+        duration = packed & 0xffff
+        event = (packed >> 16) & 1
+        if not event or not duration:
+            continue
+        moment = datetime.fromtimestamp(timestamp)
+        start = moment.hour * 3600 + moment.minute * 60 + moment.second
+        highlights.append({"date": moment.strftime("%Y%m%d"), "start": start, "end": min(86400, start + duration)})
+    return highlights
+
+
 class PlayerHandler(BaseHTTPRequestHandler):
     protocol_version = "HTTP/1.1"
 
@@ -82,6 +102,9 @@ class PlayerHandler(BaseHTTPRequestHandler):
             return self.send_json(self.server.encode_status)
         if request.path == "/api/highlights":
             return self.send_json(self.server.highlights)
+        if request.path == "/api/system-highlights":
+            date = parse_qs(request.query).get("date", [""])[0]
+            return self.send_json([item for item in self.server.system_highlights if item["date"] == date])
         if request.path == "/video":
             return self.send_video(request.query)
         self.send_error(404)
@@ -276,6 +299,7 @@ def main():
     server.output_root = args.root.expanduser().resolve()
     server.highlights_path = server.output_root / "highlights.json"
     server.highlights = load_highlights(server.highlights_path)
+    server.system_highlights = scan_system_highlights(server.source_root)
     server.encode_status = {"running": False, "total": 0, "completed": 0, "skipped": 0, "failed": 0}
     count = sum(map(len, recordings.values()))
     print(f"Indexed {count} recordings across {len(recordings)} days")