diff --git a/lora-trigger-sheet b/lora-trigger-sheet
index 45d1bc4..29a2839 100755
--- a/lora-trigger-sheet
+++ b/lora-trigger-sheet
@@ -15,6 +15,11 @@ import struct
 import sys
 from pathlib import Path
 
+import hashlib
+import time
+from urllib.error import HTTPError, URLError
+from urllib.request import urlopen, Request
+
 
 def read_safetensors_meta(filepath):
     try:
@@ -127,7 +132,106 @@ def html_id():
     return hashlib.md5(str(time.monotonic_ns()).encode()).hexdigest()[:8]
 
 
-def generate_html(loras):
+# --- Source URL lookup cache ---
+
+CACHE_DIR = os.path.expanduser("~/.cache")
+CACHE_FILE = os.path.join(CACHE_DIR, "lora-sources.json")
+
+
+def load_source_cache():
+    if os.path.exists(CACHE_FILE):
+        try:
+            with open(CACHE_FILE) as f:
+                return json.load(f)
+        except (json.JSONDecodeError, IOError):
+            return {}
+    return {}
+
+
+def save_source_cache(cache):
+    os.makedirs(CACHE_DIR, exist_ok=True)
+    with open(CACHE_FILE, "w") as f:
+        json.dump(cache, f, indent=2)
+
+
+def file_blake2b_hash(filepath):
+    h = hashlib.blake2b(digest_size=32)
+    with open(filepath, "rb") as f:
+        while True:
+            chunk = f.read(65536)
+            if not chunk:
+                break
+            h.update(chunk)
+    return h.hexdigest()
+
+
+def _fetch_json(url, timeout=10):
+    req = Request(url, headers={"User-Agent": "lora-trigger-sheet/1.0"})
+    with urlopen(req, timeout=timeout) as resp:
+        return json.loads(resp.read().decode())
+
+
+def lookup_source(filepath, filename, cache):
+    now = int(time.time())
+    cached = cache.get(filename)
+    if cached:
+        url = cached.get("url")
+        label = cached.get("label")
+        if url and (now - cached.get("last_checked", 0)) < 86400 * 30:
+            return url, label
+
+    # CivitAI model-version lookup by BLAKE2b file hash
+    try:
+        h = file_blake2b_hash(filepath)
+        data = _fetch_json(
+            f"https://civitai.com/api/v1/model-versions/by-hash/{h}"
+        )
+        if isinstance(data, dict):
+            model_id = data.get("modelId")
+            version_id = data.get("id")
+            if model_id:
+                url = f"https://civitai.com/models/{model_id}"
+                if version_id:
+                    url += f"?modelVersionId={version_id}"
+                cache[filename] = {
+                    "url": url, "label": "CivitAI",
+                    "model_name": data.get("name", ""),
+                    "last_checked": now,
+                }
+                return url, "CivitAI"
+    except (HTTPError, URLError, json.JSONDecodeError, OSError):
+        pass
+
+    # Fallback: HuggingFace model search by filename
+    try:
+        q = (
+            filename.replace(".safetensors", "")
+            .replace("_", " ")
+            .replace("-", " ")
+        )
+        data = _fetch_json(
+            "https://huggingface.co/api/models"
+            f"?search={q}&sort=downloads&direction=-1&limit=3"
+        )
+        if isinstance(data, list) and len(data) > 0:
+            model_id = data[0].get("modelId", "")
+            if model_id:
+                url = f"https://huggingface.co/{model_id}"
+                cache[filename] = {
+                    "url": url, "label": "HuggingFace",
+                    "model_name": model_id, "last_checked": now,
+                }
+                return url, "HuggingFace"
+    except (HTTPError, URLError, json.JSONDecodeError, OSError):
+        pass
+
+    cache[filename] = {"url": None, "label": None, "last_checked": now}
+    return None, None
+
+
+def generate_html(loras, sources=None):
+    if sources is None:
+        sources = {}
     rows = []
     no_trigger_files = []
 
@@ -165,18 +269,24 @@ def generate_html(loras):
             no_trigger_files.append((fname_no_ext, tool, base))
             triggers = "<span class=\"n\">(none)</span>"
 
-        rows.append((fname_no_ext, tool, base, triggers))
+        src_url, src_label = sources.get(fname, (None, None))
+        rows.append((fname_no_ext, tool, base, triggers, src_url or "", src_label or ""))
 
     num_files = len(rows)
 
     table_rows = ""
-    for fname, tool, base, triggers in rows:
+    for fname, tool, base, triggers, src_url, src_label in rows:
+        if src_url:
+            src_cell = f'<a href="{_e(src_url)}" target="_blank" rel="noopener">{_e(src_label)}</a>'
+        else:
+            src_cell = '<span class="n">—</span>'
         table_rows += (
             f"    <tr>\n"
             f"      <td class=\"fn\">{_e(fname)}</td>\n"
             f"      <td class=\"tl\">{_e(tool)}</td>\n"
             f"      <td class=\"bm\">{_e(base)}</td>\n"
             f"      <td class=\"tr\">{triggers}</td>\n"
+            f"      <td class=\"sr\">{src_cell}</td>\n"
             f"    </tr>\n"
         )
 
@@ -209,8 +319,9 @@ tr:hover td{{background:#161b22}}
 .ml:hover{{border-bottom:1px solid #58a6ff}}
 .ht{{display:none}}
 mark.hl{{background:#264f78;color:#f0f6fc;border-radius:2px;padding:0 2px}}
-.c0{{width:26%}}.c1{{width:9%}}.c2{{width:13%}}.c3{{width:52%}}
-@media(max-width:768px){{.c1,.c2,td:nth-child(2),td:nth-child(3){{display:none}}.c0{{width:30%}}.c3{{width:70%}}}}
+.sr a{{color:#58a6ff;text-decoration:none;font-size:0.78rem}}
+.c0{{width:24%}}.c1{{width:8%}}.c2{{width:12%}}.c3{{width:48%}}.c4{{width:8%}}
+@media(max-width:768px){{.c1,.c2,.c4,td:nth-child(2),td:nth-child(3),td:nth-child(5){{display:none}}.c0{{width:30%}}.c3{{width:70%}}}}
 .foot{{margin-top:20px;color:#8b949e}}
 .foot h2{{font-size:1rem;color:#f0f6fc;margin-bottom:6px}}
 .foot ul{{list-style:none;columns:3;font-size:0.82rem}}
@@ -225,6 +336,7 @@ mark.hl{{background:#264f78;color:#f0f6fc;border-radius:2px;padding:0 2px}}
 <th class="c1" onclick="s(1)">Tool <span class="ar"></span></th>
 <th class="c2" onclick="s(2)">Base <span class="ar"></span></th>
 <th class="c3" onclick="s(3)">Trigger(s) <span class="ar"></span></th>
+<th class="c4" onclick="s(4)">Source <span class="ar"></span></th>
 </tr></thead><tbody id="b">
 {table_rows}</tbody></table>
 
@@ -354,7 +466,20 @@ def main():
         meta = read_safetensors_meta(fpath)
         loras.append((fname, meta))
 
-    html = generate_html(loras)
+    # Look up source URLs with disk-backed cache
+    cache = load_source_cache()
+    sources = {}
+    total = len(loras)
+    for i, (fname, _) in enumerate(loras, 1):
+        fpath = os.path.join(target, fname)
+        url, label = lookup_source(fpath, fname, cache)
+        if url:
+            sources[fname] = (url, label)
+        if i % 10 == 0 or i == total:
+            print(f"  source lookup: {i}/{total}", file=sys.stderr)
+    save_source_cache(cache)
+
+    html = generate_html(loras, sources)
 
     if len(args) >= 2:
         out_path = os.path.abspath(os.path.expanduser(args[1]))
@@ -364,7 +489,8 @@ def main():
     with open(out_path, "w") as f:
         f.write(html)
 
-    print(f"Generated {out_path} with {len(loras)} LoRA entries")
+    out_count = sum(1 for v in sources.values() if v[0])
+    print(f"Generated {out_path} with {len(loras)} LoRA entries ({out_count} with source links)")
 
 
 if __name__ == "__main__":