diff --git a/conf/upgrade.msg b/conf/upgrade.msg
new file mode 100644
index 0000000..e3edfed
--- /dev/null
+++ b/conf/upgrade.msg
@@ -0,0 +1,4 @@
+I Hate Money was successfully upgraded :)
+Please open https://__DOMAIN____PATH_URL__/admin
+The admin password is: __PASSWORD__
+If you facing an issue or want to improve this app, please open a new issue in this project: https://github.com/YunoHost-Apps/ihatemoney_ynh
\ No newline at end of file
diff --git a/doc/DESCRIPTION_fr.md b/doc/DESCRIPTION_fr.md
new file mode 100644
index 0000000..4cf40df
--- /dev/null
+++ b/doc/DESCRIPTION_fr.md
@@ -0,0 +1 @@
+I hate money est une application web conçue pour faciliter la gestion partagée du budget. Elle permet de savoir qui a acheté quoi, quand et pour qui, et aide à régler les factures.
diff --git a/doc/DISCLAIMER.md b/doc/DISCLAIMER.md
index 37b4fcf..69c994f 100644
--- a/doc/DISCLAIMER.md
+++ b/doc/DISCLAIMER.md
@@ -8,3 +8,5 @@
   - no yunohost login required
   - per-project identifiers required
   - any visitor can create a new project.
+
+* During upgrade from version 4.1.5~ynh3, a new admin password is generated and sent to the root
diff --git a/doc/DISCLAIMER_fr.md b/doc/DISCLAIMER_fr.md
index 5403414..892196b 100644
--- a/doc/DISCLAIMER_fr.md
+++ b/doc/DISCLAIMER_fr.md
@@ -8,3 +8,5 @@
   - authentification Yunohost non requise
   - identifiants de projets requis
   - Tout visiteur peut créer un nouveau projet.
+
+* Lors de la mise à jour de la version 4.1.5~ynh3, un nouveau mot de passe administrateur est généré et envoyé à root.
diff --git a/scripts/upgrade b/scripts/upgrade
index 309ca1a..e2ba95a 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -7,6 +7,7 @@
 #=================================================
 
 source _common.sh
+source ynh_send_readme_to_admin__2
 source /usr/share/yunohost/helpers
 
 #=================================================
@@ -114,7 +115,7 @@ fi
 
 # If hashed_password doesn't exist, create it
 if [ -z "$hashed_password" ]; then
-	password=$(ynh_string_random --length=8)
+	password=$(ynh_string_random --length=16)
 	#run source in a 'sub shell'
 	(
 		set +o nounset
@@ -126,7 +127,7 @@ if [ -z "$hashed_password" ]; then
 	hashed_password=$(cat $final_path/key.txt)
 	ynh_secure_remove --file="$final_path/key.txt"
 	ynh_app_setting_set --app=$app --key=hashed_password --value=$hashed_password
-	ynh_script_progression --message="A new password for $app has been generated, it's $password ..."
+	ynh_send_readme_to_admin --app_message="../conf/upgrade.msg" --type="upgrade"
 fi
 
 #=================================================
diff --git a/scripts/ynh_send_readme_to_admin__2 b/scripts/ynh_send_readme_to_admin__2
new file mode 100644
index 0000000..6a0ba70
--- /dev/null
+++ b/scripts/ynh_send_readme_to_admin__2
@@ -0,0 +1,128 @@
+#!/bin/bash
+
+# Send an email to inform the administrator
+#
+# usage: ynh_send_readme_to_admin --app_message=app_message [--recipients=recipients] [--type=type]
+# | arg: -m --app_message= - The file with the content to send to the administrator.
+# | arg: -r, --recipients= - The recipients of this email. Use spaces to separate multiples recipients. - default: root
+#	example: "root admin@domain"
+#	If you give the name of a YunoHost user, ynh_send_readme_to_admin will find its email adress for you
+#	example: "root admin@domain user1 user2"
+# | arg: -t, --type= - Type of mail, could be 'backup', 'change_url', 'install', 'remove', 'restore', 'upgrade'
+#
+# Requires YunoHost version 4.1.0 or higher.
+ynh_send_readme_to_admin() {
+	# Declare an array to define the options of this helper.
+	declare -Ar args_array=( [m]=app_message= [r]=recipients= [t]=type= )
+	local app_message
+	local recipients
+	local type
+	# Manage arguments with getopts
+
+	ynh_handle_getopts_args "$@"
+	app_message="${app_message:-}"
+	recipients="${recipients:-root}"
+	type="${type:-install}"
+
+	# Get the value of admin_mail_html
+	admin_mail_html=$(ynh_app_setting_get $app admin_mail_html)
+	admin_mail_html="${admin_mail_html:-0}"
+
+	# Retrieve the email of users
+	find_mails () {
+		local list_mails="$1"
+		local mail
+		local recipients=" "
+		# Read each mail in argument
+		for mail in $list_mails
+		do
+			# Keep root or a real email address as it is
+			if [ "$mail" = "root" ] || echo "$mail" | grep --quiet "@"
+			then
+				recipients="$recipients $mail"
+			else
+				# But replace an user name without a domain after by its email
+				if mail=$(ynh_user_get_info "$mail" "mail" 2> /dev/null)
+				then
+					recipients="$recipients $mail"
+				fi
+			fi
+		done
+		echo "$recipients"
+	}
+	recipients=$(find_mails "$recipients")
+
+	# Subject base
+	local mail_subject="☁️🆈🅽🅷☁️: \`$app\`"
+
+	# Adapt the subject according to the type of mail required.
+	if [ "$type" = "backup" ]; then
+		mail_subject="$mail_subject has just been backup."
+	elif [ "$type" = "change_url" ]; then
+		mail_subject="$mail_subject has just been moved to a new URL!"
+	elif [ "$type" = "remove" ]; then
+		mail_subject="$mail_subject has just been removed!"
+	elif [ "$type" = "restore" ]; then
+		mail_subject="$mail_subject has just been restored!"
+	elif [ "$type" = "upgrade" ]; then
+		mail_subject="$mail_subject has just been upgraded!"
+	else	# install
+		mail_subject="$mail_subject has just been installed!"
+	fi
+
+	ynh_add_config --template="$app_message" --destination="../conf/msg_to_send"
+
+	ynh_delete_file_checksum --file="../conf/msg_to_send"
+	local mail_message="This is an automated message from your beloved YunoHost server.
+
+Specific information for the application $app.
+
+$(cat "../conf/msg_to_send")"
+
+	# Store the message into a file for further modifications.
+	echo "$mail_message" > mail_to_send
+
+	# If a html email is required. Apply html tags to the message.
+ 	if [ "$admin_mail_html" -eq 1 ]
+ 	then
+		# Insert 'br' tags at each ending of lines.
+		ynh_replace_string "$" "<br>" mail_to_send
+
+		# Insert starting HTML tags
+		sed --in-place '1s@^@<!DOCTYPE html>\n<html>\n<head></head>\n<body>\n@' mail_to_send
+
+		# Keep tabulations
+		ynh_replace_string "  " "\&#160;\&#160;" mail_to_send
+		ynh_replace_string "\t" "\&#160;\&#160;" mail_to_send
+
+		# Insert url links tags
+		ynh_replace_string "__URL_TAG1__\(.*\)__URL_TAG2__\(.*\)__URL_TAG3__" "<a href=\"\2\">\1</a>" mail_to_send
+
+		# Insert finishing HTML tags
+		echo -e "\n</body>\n</html>" >> mail_to_send
+
+	# Otherwise, remove tags to keep a plain text.
+	else
+		# Remove URL tags
+		ynh_replace_string "__URL_TAG[1,3]__" "" mail_to_send
+		ynh_replace_string "__URL_TAG2__" ": " mail_to_send
+	fi
+
+	# Define binary to use for mail command
+	if [ -e /usr/bin/bsd-mailx ]
+	then
+		local mail_bin=/usr/bin/bsd-mailx
+	else
+		local mail_bin=/usr/bin/mail.mailutils
+	fi
+
+	if [ "$admin_mail_html" -eq 1 ]
+	then
+		content_type="text/html"
+	else
+		content_type="text/plain"
+	fi
+
+	# Send the email to the recipients
+	cat mail_to_send | $mail_bin -a "Content-Type: $content_type; charset=UTF-8" -s "$mail_subject" "$recipients"
+}