diff --git a/INSTALL.md b/INSTALL.md
index 5db8f8d..d7b031d 100644
--- a/INSTALL.md
+++ b/INSTALL.md
@@ -154,7 +154,7 @@ be useful (tail -f /var/log/apache2/error.log)
 # 8 - Connecting your CalDAV / CardDAV client to Baïkal Server
 
 ## Apple iCal:
-Add a new CalDAV account 
+Add a new CalDAV account:
 	* username: the username you just created (in our example, jerome) 
 	* password: the password you just defined 
 	* In server address: http://dav.mydomain.com/cal.php/principals/jerome 
@@ -165,6 +165,13 @@ Add a new CardDAV account:
 	* password: the password you just defined 
 	* In server address: http://dav.mydomain.com/card.php/addressbooks/jerome/default 
 
+## Thunderbird/Lighning:
+Add a new CalDAV account:
+	* Navigate to "Lightning" > "New account" > "On the network" > "URL"
+	* paste this URL: http://yourdomain.com/cal.php/calendars/username/default
+	  of and replace the domain name, and the username with the correct values
+	* When asked, provide user/password; your CalDAV account should be up and running
+
 # 9 - You're done
 
 You may now create new calendars, new events, new visit cards :) Enjoy.