Updated Updating wildduck via git (markdown)

Updating-wildduck-via-git.md

@@ -9,3 +9,16 @@ This page assumes you have installed the complete wildduck setup:
 - redis for communication between components (wildduck <-> haraka-wildduck <-> zone-mta) and also for multi-server setup
 
 Via our `/setup/get_install.sh` script either on VPS or physical server (tested on ubuntu 16.04.4).
+
+# Filesystem
+
+After installation `.git` directory is separated from the programs' folder:
+- `/opt/haraka/plugins/wildduck` <-> `/var/opt/haraka-plugin-wildduck.git`
+- `/opt/wildduck` <-> `wildduck.git/`
+- `/opt/wildduck-webmail` <-> `wildduck-webmail.git/`
+- `/opt/zone-mta` <-> `zone-mta.git/`
+- `/opt/zone-mta/plugins/wildduck` <-> `zonemta-wildduck.git/`
+
+Precaution must be taken when updating git (`git pull`), as we need both specify the 
+*working director* and also the *git directory* too.
+