diff --git a/aleksis/core/models.py b/aleksis/core/models.py
index 9818849d081bf86f52fc140c13ef23a89d631782..48b23a4b00b1c33a9ddd060d03876994e918c128 100644
--- a/aleksis/core/models.py
+++ b/aleksis/core/models.py
@@ -73,7 +73,7 @@ class SchoolYear(ExtensibleModel):
         return cls.get_current()
 
     def clean(self):
-        """Ensure there is only one school year of each point of time."""
+        """Ensure there is only one school year at each point of time."""
         if self.date_end < self.date_start:
             raise ValidationError(_("The start date must be earlier than the end date."))