diff --git a/freqtrade/data/btanalysis.py b/freqtrade/data/btanalysis.py
index edac74d51..96ab4927e 100644
--- a/freqtrade/data/btanalysis.py
+++ b/freqtrade/data/btanalysis.py
@@ -12,7 +12,7 @@ import pandas as pd
 
 from freqtrade.constants import LAST_BT_RESULT_FN, IntOrInf
 from freqtrade.exceptions import OperationalException
-from freqtrade.misc import json_load
+from freqtrade.misc import file_dump_json, json_load
 from freqtrade.optimize.backtest_caching import get_backtest_metadata_filename
 from freqtrade.persistence import LocalTrade, Trade, init_db
 from freqtrade.types import BacktestHistoryEntryType, BacktestResultType
@@ -219,6 +219,21 @@ def delete_backtest_result(file_abs: Path):
     file_abs_meta.unlink()
 
 
+def update_backtest_metadata(filename: Path, strategy: str, content: Dict[str, Any]):
+    """
+    Updates backtest metadata file with new content.
+    :raises: ValueError if metadata file does not exist, or strategy is not in this file.
+    """
+    metadata = load_backtest_metadata(filename)
+    if not metadata:
+        raise ValueError("File does not exist.")
+    if strategy not in metadata:
+        raise ValueError("Strategy not in metadata.")
+    metadata[strategy].update(content)
+    # Write data again.
+    file_dump_json(get_backtest_metadata_filename(filename), metadata)
+
+
 def find_existing_backtest_stats(dirname: Union[Path, str], run_ids: Dict[str, str],
                                  min_backtest_date: Optional[datetime] = None) -> Dict[str, Any]:
     """
diff --git a/freqtrade/rpc/api_server/api_backtest.py b/freqtrade/rpc/api_server/api_backtest.py
index 6d3174a5a..3bfad2f56 100644
--- a/freqtrade/rpc/api_server/api_backtest.py
+++ b/freqtrade/rpc/api_server/api_backtest.py
@@ -10,14 +10,15 @@ from fastapi.exceptions import HTTPException
 
 from freqtrade.configuration.config_validation import validate_config_consistency
 from freqtrade.constants import Config
-from freqtrade.data.btanalysis import (delete_backtest_result, get_backtest_resultlist,
-                                       load_and_merge_backtest_result)
+from freqtrade.data.btanalysis import (delete_backtest_result, get_backtest_result,
+                                       get_backtest_resultlist, load_and_merge_backtest_result,
+                                       update_backtest_metadata)
 from freqtrade.enums import BacktestState
 from freqtrade.exceptions import DependencyException, OperationalException
 from freqtrade.exchange.common import remove_exchange_credentials
 from freqtrade.misc import deep_merge_dicts, is_file_in_dir
-from freqtrade.rpc.api_server.api_schemas import (BacktestHistoryEntry, BacktestRequest,
-                                                  BacktestResponse)
+from freqtrade.rpc.api_server.api_schemas import (BacktestHistoryEntry, BacktestMetadataUpdate,
+                                                  BacktestRequest, BacktestResponse)
 from freqtrade.rpc.api_server.deps import get_config
 from freqtrade.rpc.api_server.webserver_bgwork import ApiBG
 from freqtrade.rpc.rpc import RPCException
@@ -281,3 +282,24 @@ def api_delete_backtest_history_entry(file: str, config=Depends(get_config)):
 
     delete_backtest_result(file_abs)
     return get_backtest_resultlist(config['user_data_dir'] / 'backtest_results')
+
+
+@router.patch('/backtest/history/{file}', response_model=List[BacktestHistoryEntry],
+              tags=['webserver', 'backtest'])
+def api_update_backtest_history_entry(file: str, body: BacktestMetadataUpdate,
+                                      config=Depends(get_config)):
+    # Get backtest result history, read from metadata files
+    bt_results_base: Path = config['user_data_dir'] / 'backtest_results'
+    file_abs = (bt_results_base / file).with_suffix('.json')
+    # Ensure file is in backtest_results directory
+    if not is_file_in_dir(file_abs, bt_results_base):
+        raise HTTPException(status_code=404, detail="File not found.")
+    content = {
+        'notes': body.notes
+    }
+    try:
+        update_backtest_metadata(file_abs, body.strategy, content)
+    except ValueError as e:
+        raise HTTPException(status_code=400, detail=str(e))
+
+    return get_backtest_result(file_abs)
diff --git a/freqtrade/rpc/api_server/api_schemas.py b/freqtrade/rpc/api_server/api_schemas.py
index f96e586bb..ca39b11fd 100644
--- a/freqtrade/rpc/api_server/api_schemas.py
+++ b/freqtrade/rpc/api_server/api_schemas.py
@@ -529,6 +529,11 @@ class BacktestHistoryEntry(BaseModel):
     notes: Optional[str] = ''
 
 
+class BacktestMetadataUpdate(BaseModel):
+    strategy: str
+    notes: Optional[str]
+
+
 class SysInfo(BaseModel):
     cpu_pct: List[float]
     ram_pct: float