diff --git a/README.md b/README.md
index be7747b..4199891 100644
--- a/README.md
+++ b/README.md
@@ -28,13 +28,13 @@ metrics:
   image: yavook/kiwi-simple-metrics:0.1
   environment:
     METRICS__LOG__ENABLED: "True"
-    METRICS__WEBHOOK__URL: "https://my.webhook.host/success?report={}"
-    METRICS__WEBHOOK__FAIL: "https://my.webhook.host/failure?report={}"
+    METRICS__WEBHOOK__URL: "https://my.webhook.host/success?report={result}"
+    METRICS__WEBHOOK__FAIL: "https://my.webhook.host/failure?report={result}"
 ```
 
 - same metrics as above
 - logs reports to stdout
-- triggers webhooks (`{}` is the placeholder for the result string)
+- triggers webhooks (`{result}` is the placeholder for the result string)
 
 ## Configuration
 
diff --git a/kiwi_simple_metrics/metrics/_report.py b/kiwi_simple_metrics/metrics/_report.py
index 5cf4044..5d8bac4 100644
--- a/kiwi_simple_metrics/metrics/_report.py
+++ b/kiwi_simple_metrics/metrics/_report.py
@@ -126,7 +126,7 @@ class Report:
 
         requests.get(
             url=str(url).format(
-                urllib.parse.quote_plus(self.result)
+                result=urllib.parse.quote_plus(self.result)
             ),
             verify=not SETTINGS.webhook.insecure,
         )