diff --git a/README.md b/README.md
index c85c145..d0dd04b 100644
--- a/README.md
+++ b/README.md
@@ -17,10 +17,17 @@ Help for dev/testing hightly appreciated :)
     * Backup/restore scripts
     * Adding / removing a link
     * Upgrade *not tested*
+    * Configure Shaarli during installation
+
+## Installation information
+
+When doing the installation you will be prompted if you want to have a public site, meaning that you don't have to be a user of this Yunohost instance to access the site.
+
+You will also be asked if you want to   have a private instance, meaning that the authentication will be deactivated and the application will be only available to the owner designed during install.
 
 ## TODO
-
-    * Configure Shaarli during installation
+    
+    * Integrate the ssowat authentication (currently the authentication is done by Shaarli)
     * Test more the package
 
 ## Changelog
diff --git a/manifest.json b/manifest.json
index 9553077..b5a328b 100644
--- a/manifest.json
+++ b/manifest.json
@@ -40,8 +40,8 @@
       "name": "admin",
       "type": "user",
       "ask": {
-        "en": "Admin user",
-        "fr": "Administrateur"
+        "en": "Owner of the Shaarli instance",
+        "fr": "Proprietaire de l'instance Shaarli"
       },
       "example": "test"
     },
@@ -80,6 +80,15 @@
       },
       "choices": ["Yes", "No"],
       "default": "Yes"
+    },
+    {
+      "name": "privateinstance",
+      "ask": {
+        "en": "Is the instance private?",
+        "fr": "Cette instance est elle privée ?"
+      },
+      "choices": ["Yes", "No"],
+      "default": "No"
     }
     ]
   }
diff --git a/scripts/install b/scripts/install
index 09aefe9..ee98524 100644
--- a/scripts/install
+++ b/scripts/install
@@ -23,15 +23,22 @@ is_public=$YNH_APP_ARG_IS_PUBLIC
 title=$YNH_APP_ARG_TITLE
 privatelinkbydefault=$YNH_APP_ARG_PRIVATELINKBYDEFAULT
 password=$YNH_APP_ARG_PASSWORD
+privateinstance=$YNH_APP_ARG_PRIVATEINSTANCE
 
 # Load common variables and helpers
 source ./_common.sh
 
+# Check that the options are compatible
+if [ $is_public = "Yes" ]; then
+  if [ $privateinstance = "Yes" ] ; then
+    ynh_die "Incompatible options: the instance cannot be both public and private" 1
+  fi
+fi
+
 # Check that admin user is an existing account
 sudo yunohost user list --json | grep -q "\"username\": \"$admin\""
 if [[ ! $? -eq 0 ]]; then
-echo "Error : the chosen admin user does not exist"
-exit 1
+ynh_die "Error : the chosen user does not exist" 1
 fi
 sudo yunohost app setting $app admin -v $admin
 
@@ -72,6 +79,10 @@ sudo sed -i "s@YNH_HASH@$password_hash@g" ../conf/config.json.php
 sudo sed -i "s@YNH_TIMEZONE@$(cat /etc/timezone)@g" ../conf/config.json.php
 sudo sed -i "s@YNH_TITLE@$title@g" ../conf/config.json.php
 sudo sed -i "s@YNH_PRIVATE_LINK_BY_DEFAULT@$privatelinkbydefault_php@g" ../conf/config.json.php
+# turn off authentication on the instance
+if [ $privateinstance = "Yes" ] ; then
+  sudo sed -i "/open_shaarli/s/false/true/" ../conf/config.json.php 
+fi
 
 # Populate the data directory of the shaarli instance
 sudo cp ../conf/config.json.php $final_path/data
@@ -102,6 +113,9 @@ sudo cp ../conf/nginx.conf /etc/nginx/conf.d/$domain.d/$app.conf
 # Reload Nginx and regenerate SSOwat conf
 if [ $is_public = "Yes" ]; then
 sudo yunohost app setting $app unprotected_uris -v "/"
+elif [ $privateinstance = "Yes" ] ; then
+# Configure SSOWat to prevent access for other users
+sudo yunohost app setting $app allowed_users -v "$admin"
 fi
 sudo service nginx reload
 sudo yunohost app ssowatconf