diff --git a/weather_report.py b/weather_report.py
index 4f5fd58..ef67d13 100644
--- a/weather_report.py
+++ b/weather_report.py
@@ -49,7 +49,7 @@ def last_month_range() -> tuple[datetime, datetime, str]:
     today = datetime.now(timezone.utc)
     first_of_this = today.replace(day=1, hour=0, minute=0, second=0, microsecond=0)
     start = (first_of_this - timedelta(days=1)).replace(day=1, hour=0, minute=0, second=0, microsecond=0)
-    end = first_of_this  # exklusives Ende: < Juni 1 = komplett Mai
+    end = first_of_this + timedelta(days=1)  # inkl. 1. Folgemonat
     label = f"{MONTHS_DE[start.month - 1]} {start.year}"
     return start, end, label