diff --git a/scripts/generate_site.py b/scripts/generate_site.py
index 432f7800..c1e04dad 100644
--- a/scripts/generate_site.py
+++ b/scripts/generate_site.py
@@ -1840,6 +1840,15 @@ def generate_platform_page(
         lines.append(f"| BIOS path | `{base_dest}/` |")
     if homepage:
         lines.append(f"| Homepage | [{homepage}]({homepage}) |")
+    transcribed = str(config.get("source") or "")
+    if transcribed:
+        # The file every declaration on this page was read from: without it
+        # a hash could not be traced to the revision that states it.
+        moving = re.search(r"/(?:master|main|db)(?:/|$)|refs/heads/", transcribed) or (
+            re.fullmatch(r"https://(?:github|gitlab)\.com/[^/]+/[^/]+/?", transcribed)
+        )
+        note = " (a branch: the revision read is not recorded)" if moving else ""
+        lines.append(f"| Transcribed from | <{transcribed}>{note} |")
     contrib_list = (registry or {}).get(name, {}).get("contributed_by", [])
     if contrib_list:
         for cb in contrib_list:
diff --git a/tests/test_site_exports.py b/tests/test_site_exports.py
index 65a7bbaa..de67ce07 100644
--- a/tests/test_site_exports.py
+++ b/tests/test_site_exports.py
@@ -607,5 +607,25 @@ class ADataDirectorySaysWhatItIs(unittest.TestCase):
         self.assertIn("src/main.cpp#L10", page)
 
 
+class APlatformPageNamesTheFileItTranscribes(unittest.TestCase):
+    """Batocera's page gave 'Version 43.1' and a homepage, never the
+    batocera-systems revision every md5 on it comes from."""
+
+    def test_pinned_and_moving_sources(self):
+        import generate_site  # noqa: PLC0415
+
+        def page(source: str) -> str:
+            cov = {"platform": "P", "config": {"source": source, "systems": {}},
+                   "details": [], "total": 0, "verified": 0, "present": 0,
+                   "missing": 0, "untested": 0, "mode": "md5"}
+            return generate_site.generate_platform_page("p", cov)
+
+        tag = "https://raw.githubusercontent.com/o/r/batocera-43.1/x/batocera-systems"
+        self.assertIn(f"| Transcribed from | <{tag}> |", page(tag))
+        branch = "https://raw.githubusercontent.com/o/r/master/x.json"
+        self.assertIn("revision read is not recorded", page(branch))
+        self.assertIn("revision read is not recorded", page("https://github.com/RetroDECK/components"))
+
+
 if __name__ == "__main__":
     unittest.main()