diff --git a/leasing/serializers/rent.py b/leasing/serializers/rent.py
index 15d2a70b..8b9a7010 100644
--- a/leasing/serializers/rent.py
+++ b/leasing/serializers/rent.py
@@ -51,10 +51,10 @@ class Meta:
 
 class IndexNumberYearlySerializer(serializers.Serializer):
     id = serializers.IntegerField(required=False)
-    number = serializers.DecimalField(max_digits=10, decimal_places=2)
+    number = serializers.DecimalField(max_digits=8, decimal_places=1)
     year = serializers.IntegerField()
     region = serializers.CharField(max_length=255, required=False, allow_null=True)
-    comment = serializers.CharField(max_length=255, required=False, allow_null=True)
+    comment = serializers.CharField(required=False, allow_null=True)
 
     class Meta:
         model = IndexNumberYearly