diff --git a/DOCUMENTATION.md b/DOCUMENTATION.md
index 153eb61..a1101d8 100644
--- a/DOCUMENTATION.md
+++ b/DOCUMENTATION.md
@@ -342,7 +342,7 @@ You can choose any value between 1 week and 78 weeks.
 
 To use this feature will need version 6.4.0 of the Python client library, or a more recent version.
 
-If you do not choose a value, the file will be available for the default period of 26 weeks (6 months).
+If you do not choose a value, the file will be available for the default period of 78 weeks (18 months).
 
 ```python
 from notifications_python_client import prepare_upload