diff --git a/docs/ecolyo/technical/mail.md b/docs/ecolyo/technical/mail.md
index 7d3bcb40be4bb2294216473bb2c87ed6d87d2b4c..3f9ae2d149b0a23281d8aa300bd225af44bae2f1 100644
--- a/docs/ecolyo/technical/mail.md
+++ b/docs/ecolyo/technical/mail.md
@@ -81,4 +81,4 @@ A bounce token stored in the profile of each user is sent in email. It allows us
 
 ## Unsubscribe
 
-A user can unsubscribe to our newsletter by a link in each mails. It **does not** require authentication. This link is built with a `sharecode` token that contains specific permissions to turn off the `sendAnalysisNotification` property in the user profile.
+A user can unsubscribe to our newsletter by a link in each mails. It **does not** require authentication. This link is built with a `sharecode` token that contains specific permissions to turn off the `sendAnalysisNotification` property in the user profile. The sent link has a TTL of 15 days.