diff --git a/account/address_book.markdown b/account/address_book.markdown
index 85159ffa6b11274bfff7136351b9ee5f3740b477..e7fe864bce2314be6d2ad6828dd93adc9a4690b6 100644
--- a/account/address_book.markdown
+++ b/account/address_book.markdown
@@ -4,7 +4,7 @@ Address Book
 ETH Directory binding
 ---------------------
 
-ETH Zurich offers an AD/LDAP directory with all employees and students. Please refer to the [documentation of ID](https://unlimited.ethz.ch/display/itkb/Mailbox) and search `Address query` on that page, if you want to include it as address book in your mail client.
+ETH Zurich offers an AD/LDAP directory with all employees and students. Please refer to the [documentation of ID](https://unlimited.ethz.ch/display/itkb/Mailbox) and search `Address query` on that page, if you want to include it as address book in your mail client. In particular there's a detailed [documentation for Thunderbird](https://unlimited.ethz.ch/spaces/itkb/pages/283251869/Thunderbird+address+book+ETH+Active+Directory).
 
 
 Phonebook