diff --git a/aleksis/apps/chronos/models.py b/aleksis/apps/chronos/models.py
index ef9e0a632d25956156a93babbb7f8f751bccc9b4..572975b7d8d37343442c719c380c8c09e7d57423 100644
--- a/aleksis/apps/chronos/models.py
+++ b/aleksis/apps/chronos/models.py
@@ -326,7 +326,7 @@ class LessonPeriod(ExtensibleModel):
         """Get next lesson period of this lesson.
 
         .. warning::
-            To use this property a week had to be annotated to the provided lesson period.
+            To use this property,  the provided lesson period must be annotated with a week.
         """
         return LessonPeriod.objects.filter(lesson=self.lesson).next_lesson(self)