diff --git a/README.md b/README.md
index c85e552..3223d6b 100644
--- a/README.md
+++ b/README.md
@@ -32,7 +32,9 @@ Live capture, Windows:
 .\run-exporter.ps1 --live
 ```
 
-Launch it before logging in, then open any supported history board in game. The tool keeps listening until you press any key. Exports are written under `exports\` as `Permanent_<date_time>.csv/json`, `Limited_<date_time>.csv/json`, or `Arc_<date_time>.csv/json`.
+Launch it before logging in, then open any supported history board in game. The tool keeps listening until you press any key. Exports are written under `exports\` as `Permanent_<date_time>.json`, `Limited_<date_time>.json`, or `Arc_<date_time>.json`.
+
+Pass `--debug` to also write the full research CSV next to each JSON export.
 
 If only one banner is captured, the export JSON is copied to the clipboard. If multiple banners are captured in the same run, clipboard copy is skipped so one banner does not overwrite another.
 
diff --git a/src/nte_history_exporter/cli.py b/src/nte_history_exporter/cli.py
index d23cf53..ea1c9de 100644
--- a/src/nte_history_exporter/cli.py
+++ b/src/nte_history_exporter/cli.py
@@ -20,6 +20,7 @@ def build_parser() -> argparse.ArgumentParser:
     parser.add_argument("--flow-index", type=int, default=None)
     parser.add_argument("--interface-ip", default=None, help="local IPv4 address to bind for live capture")
     parser.add_argument("--no-clipboard", action="store_true", help="do not copy live exports to clipboard")
+    parser.add_argument("--debug", action="store_true", help="also write research CSVs next to the JSON exports")
     parser.add_argument(
         "--allow-boundary-records",
         action="store_true",
@@ -34,6 +35,7 @@ def main(argv: list[str] | None = None) -> int:
         result = run_live_capture(
             interface_ip=args.interface_ip,
             copy_clipboard=not args.no_clipboard,
+            write_debug_csv=args.debug,
         )
         for item in result["exports"]:
             export = item["export"]
@@ -69,7 +71,8 @@ def main(argv: list[str] | None = None) -> int:
         pair_count = len(decoded["pairs"])
 
     out_path, json_path = export_paths(kind)
-    write_csv(out_path, rows)
+    if args.debug:
+        write_csv(out_path, rows)
     export = build_export_json(
         rows,
         warnings,
@@ -80,7 +83,8 @@ def main(argv: list[str] | None = None) -> int:
     )
     json_path.write_text(json.dumps(export, ensure_ascii=False, indent=2), encoding="utf-8")
 
-    print(f"CSV written: {out_path}")
+    if args.debug:
+        print(f"CSV written: {out_path}")
     print(f"JSON written: {json_path}")
     print(
         "Decoded {decoded}, exported {exported}, skipped {skipped}.".format(
diff --git a/src/nte_history_exporter/live_capture/runner.py b/src/nte_history_exporter/live_capture/runner.py
index dfd74d9..3145b76 100644
--- a/src/nte_history_exporter/live_capture/runner.py
+++ b/src/nte_history_exporter/live_capture/runner.py
@@ -46,6 +46,7 @@ def run_live_capture(
     *,
     interface_ip: str | None = None,
     copy_clipboard: bool = True,
+    write_debug_csv: bool = False,
 ) -> dict:
     local_ip = interface_ip or detect_local_ipv4()
     session = LiveHistorySession(local_ip)
@@ -95,7 +96,8 @@ def run_live_capture(
             warnings = page_gap_warnings(pairs, best_run) + warnings
         pages_seen = [p[0] for p in best_run]
         csv_path, json_path = export_paths(kind)
-        write_csv(csv_path, rows)
+        if write_debug_csv:
+            write_csv(csv_path, rows)
         export = build_export_json(
             rows,
             warnings,
@@ -104,7 +106,15 @@ def run_live_capture(
         )
         payload = json.dumps(export, ensure_ascii=False, indent=2)
         json_path.write_text(payload, encoding="utf-8")
-        exports.append({"kind": kind, "csv_path": csv_path, "json_path": json_path, "export": export, "payload": payload})
+        exports.append(
+            {
+                "kind": kind,
+                "csv_path": csv_path if write_debug_csv else None,
+                "json_path": json_path,
+                "export": export,
+                "payload": payload,
+            }
+        )
 
     if not exports:
         print("No Monopoly history pages were captured.")
@@ -118,7 +128,8 @@ def run_live_capture(
         print("Multiple banners captured; clipboard copy skipped.")
 
     for item in exports:
-        print(f"CSV written: {item['csv_path']}")
+        if item["csv_path"] is not None:
+            print(f"CSV written: {item['csv_path']}")
         print(f"Export written: {item['json_path']}")
     return {"exports": exports}