diff --git a/.vscode/launch.json b/.vscode/launch.json
index 5872269..f702240 100644
--- a/.vscode/launch.json
+++ b/.vscode/launch.json
@@ -10,7 +10,7 @@
             "request": "launch",
             "module": "kiwi_simple_metrics.main",
             "env": {
-                "METRIC_DISK__PATHS": "[\"/var\", \"/\", \"/dev\"]",
+                "METRIC__DISK__PATHS": "[\"/var\", \"/\", \"/dev\"]",
             },
             "justMyCode": true
         }
diff --git a/kiwi_simple_metrics/metrics/_report.py b/kiwi_simple_metrics/metrics/_report.py
index 3ccb57b..c609f1b 100644
--- a/kiwi_simple_metrics/metrics/_report.py
+++ b/kiwi_simple_metrics/metrics/_report.py
@@ -1,7 +1,7 @@
 from dataclasses import dataclass
 from typing import Any, Callable, Iterator, Self
 
-from ..settings import MetricSettings
+from ..settings import SETTINGS, MetricSettings
 
 
 @dataclass(slots=True, kw_only=True)
@@ -43,7 +43,7 @@ class Report:
         ]
 
         return cls(
-            result=", ".join(
+            result=SETTINGS.separator.join(
                 report.result
                 for report in reports
             ),
@@ -70,7 +70,7 @@ class Report:
         return cls(
             result=settings.report_outer.format(
                 name=settings.name,
-                inner=", ".join(
+                inner=SETTINGS.separator.join(
                     report.result
                     for report in reports[:settings.count]
                 ),
diff --git a/kiwi_simple_metrics/settings.py b/kiwi_simple_metrics/settings.py
index 96d8fc2..3d2bf11 100644
--- a/kiwi_simple_metrics/settings.py
+++ b/kiwi_simple_metrics/settings.py
@@ -84,10 +84,14 @@ class DiskMS(MetricSettings):
 
 class Settings(BaseSettings):
     model_config = SettingsConfigDict(
-        env_prefix="METRIC_",
+        env_prefix="METRIC__",
         env_nested_delimiter="__",
     )
 
+    # separates metrics and values in reports
+    separator: str = ", "
+
+    # metrics settings
     cpu: CpuMS = CpuMS()
     memory: MemoryMS = MemoryMS()
     disk: DiskMS = DiskMS()