diff --git a/Home.md b/Home.md
index b767065..d9c10aa 100644
--- a/Home.md
+++ b/Home.md
@@ -54,6 +54,10 @@ DB_PASSWORD=new_password_here
 DB_SCHEMA=gba
 ```
 
+ `.env` - Environment variables can be set in this file
+
+***Note*** : You can quickly set the database information, the solr connection string and other variables in this file and have the application fully working.
+
 Save and close the file and generate a new application key
 
 `php artisan key:generate`
@@ -83,7 +87,7 @@ stop the service:
 
 ## Nginx Configuration
 
-sudo nano /etc/nginx/sites-available/tethys-app
+`sudo nano /etc/nginx/sites-available/tethys-app`
 
 **http-only configuration:**
 
@@ -130,7 +134,7 @@ server {
     listen [::]:443 ssl http2;
     listen 443 ssl http2;
     server_name localhost;
-    root   /var/www/repository.geologie.ac.at/public/;
+    root /var/www/tethys-app/public/;
     client_max_body_size 100M;
 
     index index.html index.htm index.php;
@@ -186,3 +190,17 @@ if everything is successful, reload updated nginx configuration:\
 `sudo service nginx reload`
 
 The website is available at the following link: <http://localhost:80>
+
+## Requesting https-certificate
+
+`sudo certbot certonly --nginx --webroot-path=/var/www/tethys-app/ -d www.your_domain.at -d your_domain.at`
+
+Adapt the settings 'ssl_certificate' and 'ssl_certificate_key' in the following file /etc/nginx/sites-available/tethys-app:\
+`sudo nano /etc/nginx/sites-available/tethys-app`
+
+```nginx
+ssl_certificate    /etc/letsencrypt/live/www.your_domain.at/fullchain.pem;
+ssl_certificate_key    /etc/letsencrypt/live/www.your_domain.at/privkey.pem;
+```
+
+Certbot will autmatically renew outdated certificates. Sytemd services 'cerbot.service' and 'certbot.timer' are checking twice daily whether certificates have been expired.
diff --git a/installs/PostgreSqlUbuntu.md b/installs/PostgreSqlUbuntu.md
index 32dd197..13e68ef 100644
--- a/installs/PostgreSqlUbuntu.md
+++ b/installs/PostgreSqlUbuntu.md
@@ -1,4 +1,4 @@
-## Install PostgreSQL
+# Install PostgreSQL
 
 `sudo apt install postgresql postgresql-contrib`
 
diff --git a/installs/SystemToolsUbuntu.md b/installs/SystemToolsUbuntu.md
index e7df534..5983ecb 100644
--- a/installs/SystemToolsUbuntu.md
+++ b/installs/SystemToolsUbuntu.md
@@ -114,3 +114,19 @@ Test your installation:\
 
 + test java installation:\
 `java -version`
+
+## Installation certbot for https-certificate
+
++ add cerbot repository:\
+`sudo add-apt-repository ppa:certbot/certbot`\
+`sudo apt update`
++ install cerbot:\
+`sudo apt install certbot`
++ response:\
+The following NEW packages will be installed:\
+  certbot python3-acme python3-certbot python3-configargparse\
+  python3-configobj python3-future python3-icu python3-josepy python3-mock\
+  python3-ndg-httpsclient python3-parsedatetime python3-pbr\
+  python3-requests-toolbelt python3-rfc3339 python3-tz python3-zope.component\
+  python3-zope.event python3-zope.hookable python3-zope.interface\
+0 upgraded, 19 newly installed, 0 to remove and 0 not upgraded.