diff --git a/data/helpers.d/apt b/data/helpers.d/apt
index 50db7613f..9e3f26b90 100644
--- a/data/helpers.d/apt
+++ b/data/helpers.d/apt
@@ -292,6 +292,8 @@ EOF
 # usage: ynh_add_app_dependencies --package=phpversion [--replace]
 # | arg: -p, --package=     - Packages to add as dependencies for the app.
 # | arg: -r, --replace      - Replace dependencies instead of adding to existing ones.
+#
+# Requires YunoHost version 3.8.1 or higher.
 ynh_add_app_dependencies () {
     # Declare an array to define the options of this helper.
     local legacy_args=pr
@@ -338,6 +340,8 @@ ynh_remove_app_dependencies () {
 # | arg: -p, --package= - The packages to install from this extra repository
 # | arg: -k, --key=     - url to get the public key.
 # | arg: -n, --name=    - Name for the files for this repo, $app as default value.
+#
+# Requires YunoHost version 3.8.1 or higher.
 ynh_install_extra_app_dependencies () {
     # Declare an array to define the options of this helper.
     local legacy_args=rpkn
@@ -376,6 +380,8 @@ ynh_install_extra_app_dependencies () {
 # | arg: -p, --priority=    - Priority for the pin
 # | arg: -n, --name=        - Name for the files for this repo, $app as default value.
 # | arg: -a, --append       - Do not overwrite existing files.
+#
+# Requires YunoHost version 3.8.1 or higher.
 ynh_install_extra_repo () {
     # Declare an array to define the options of this helper.
     local legacy_args=rkpna
@@ -445,6 +451,8 @@ ynh_install_extra_repo () {
 #
 # usage: ynh_remove_extra_repo [--name=name]
 # | arg: -n, --name=    - Name for the files for this repo, $app as default value.
+#
+# Requires YunoHost version 3.8.1 or higher.
 ynh_remove_extra_repo () {
     # Declare an array to define the options of this helper.
     local legacy_args=n
@@ -478,6 +486,7 @@ ynh_remove_extra_repo () {
 #                             uri                               suite   component
 # ynh_add_repo --uri=http://forge.yunohost.org/debian/ --suite=stretch --component=stable
 #
+# Requires YunoHost version 3.8.1 or higher.
 ynh_add_repo () {
     # Declare an array to define the options of this helper.
     local legacy_args=uscna
@@ -518,6 +527,7 @@ ynh_add_repo () {
 #
 # See https://manpages.debian.org/stretch/apt/apt_preferences.5.en.html#How_APT_Interprets_Priorities for information about pinning.
 #
+# Requires YunoHost version 3.8.1 or higher.
 ynh_pin_repo () {
     # Declare an array to define the options of this helper.
     local legacy_args=pirna
diff --git a/data/helpers.d/backup b/data/helpers.d/backup
index 9603ba525..a62f6c104 100644
--- a/data/helpers.d/backup
+++ b/data/helpers.d/backup
@@ -41,6 +41,7 @@ CAN_BIND=${CAN_BIND:-1}
 # # => "/etc/nginx/conf.d/$domain.d/$app.conf","apps/wordpress/conf/$app.conf"
 #
 # Requires YunoHost version 2.4.0 or higher.
+# Requires YunoHost version 3.5.0 or higher for the argument --not_mandatory
 ynh_backup() {
     # TODO find a way to avoid injection by file strange naming !
 
@@ -224,6 +225,7 @@ with open(sys.argv[1], 'r') as backup_file:
 # /etc/nginx/conf.d/$domain.d/$app.conf
 #
 # Requires YunoHost version 2.6.4 or higher.
+# Requires YunoHost version 3.5.0 or higher for the argument --not_mandatory
 ynh_restore_file () {
     # Declare an array to define the options of this helper.
     local legacy_args=odm
diff --git a/data/helpers.d/hardware b/data/helpers.d/hardware
index b46edcdd3..6702a8548 100644
--- a/data/helpers.d/hardware
+++ b/data/helpers.d/hardware
@@ -8,6 +8,8 @@
 # | arg: -s, --ignore_swap  - Ignore swap, consider only real RAM
 # | arg: -o, --only_swap    - Ignore real RAM, consider only swap
 # | ret: the amount of free ram
+#
+# Requires YunoHost version 3.8.1 or higher.
 ynh_get_ram () {
     # Declare an array to define the options of this helper.
     local legacy_args=ftso
@@ -74,6 +76,8 @@ ynh_get_ram () {
 # | arg: -s, --ignore_swap  - Ignore swap, consider only real RAM
 # | arg: -o, --only_swap    - Ignore real RAM, consider only swap
 # | exit: Return 1 if the ram is under the requirement, 0 otherwise.
+#
+# Requires YunoHost version 3.8.1 or higher.
 ynh_require_ram () {
     # Declare an array to define the options of this helper.
     local legacy_args=rftso
diff --git a/data/helpers.d/logrotate b/data/helpers.d/logrotate
index 7df954c15..d5384264c 100644
--- a/data/helpers.d/logrotate
+++ b/data/helpers.d/logrotate
@@ -16,6 +16,7 @@
 # the same logrotate config file.  Unless you use the option --non-append
 #
 # Requires YunoHost version 2.6.4 or higher.
+# Requires YunoHost version 3.2.0 or higher for the argument --specific_user
 ynh_use_logrotate () {
     # Declare an array to define the options of this helper.
     local legacy_args=lnuya
diff --git a/data/helpers.d/network b/data/helpers.d/network
index 03df04c1e..cb5a9e540 100644
--- a/data/helpers.d/network
+++ b/data/helpers.d/network
@@ -33,7 +33,7 @@ ynh_find_port () {
 # | arg: -p, --port=    - port to check
 # | exit: Return 1 if the port is already used by another process.
 #
-# Requires YunoHost version 3.7.x or higher.
+# Requires YunoHost version 3.8.0 or higher.
 ynh_port_available () {
     # Declare an array to define the options of this helper.
     local legacy_args=p
diff --git a/data/helpers.d/nginx b/data/helpers.d/nginx
index 6b60a3ef7..cd4380f16 100644
--- a/data/helpers.d/nginx
+++ b/data/helpers.d/nginx
@@ -19,6 +19,7 @@
 #   __PORT_2__    by $port_2
 #
 # Requires YunoHost version 2.7.2 or higher.
+# Requires YunoHost version 2.7.13 or higher for dynamic variables
 ynh_add_nginx_config () {
     finalnginxconf="/etc/nginx/conf.d/$domain.d/$app.conf"
     local others_var=${1:-}
diff --git a/data/helpers.d/php b/data/helpers.d/php
index 588bf7177..4ec011217 100644
--- a/data/helpers.d/php
+++ b/data/helpers.d/php
@@ -56,6 +56,8 @@ YNH_PHP_VERSION=${YNH_PHP_VERSION:-$YNH_DEFAULT_PHP_VERSION}
 #   children ready to answer.
 #
 # Requires YunoHost version 2.7.2 or higher.
+# Requires YunoHost version 3.5.1 or higher for the argument --phpversion
+# Requires YunoHost version 3.8.1 or higher for the arguments --use_template, --usage, --footprint, --package and --dedicated_service
 ynh_add_fpm_config () {
     # Declare an array to define the options of this helper.
     local legacy_args=vtufpd
@@ -312,6 +314,8 @@ ynh_remove_fpm_config () {
 # usage: ynh_install_php --phpversion=phpversion [--package=packages]
 # | arg: -v, --phpversion=  - Version of php to install.
 # | arg: -p, --package=     - Additionnal php packages to install
+#
+# Requires YunoHost version 3.8.1 or higher.
 ynh_install_php () {
     # Declare an array to define the options of this helper.
     local legacy_args=vp
@@ -364,6 +368,8 @@ ynh_install_php () {
 # [internal]
 #
 # usage: ynh_install_php
+#
+# Requires YunoHost version 3.8.1 or higher.
 ynh_remove_php () {
     # Get the version of php used by this app
     local phpversion=$(ynh_app_setting_get $app phpversion)
diff --git a/data/helpers.d/postgresql b/data/helpers.d/postgresql
index 4122deec6..4ac9fcbec 100644
--- a/data/helpers.d/postgresql
+++ b/data/helpers.d/postgresql
@@ -153,6 +153,8 @@ ynh_psql_create_user() {
 # usage: ynh_psql_user_exists --user=user
 # | arg: -u, --user=    - the user for which to check existence
 # | exit: Return 1 if the user doesn't exist, 0 otherwise
+#
+# Requires YunoHost version 3.5.0 or higher.
 ynh_psql_user_exists() {
     # Declare an array to define the options of this helper.
     local legacy_args=u
@@ -174,6 +176,8 @@ ynh_psql_user_exists() {
 # usage: ynh_psql_database_exists --database=database
 # | arg: -d, --database=    - the database for which to check existence
 # | exit: Return 1 if the database doesn't exist, 0 otherwise
+#
+# Requires YunoHost version 3.5.0 or higher.
 ynh_psql_database_exists() {
     # Declare an array to define the options of this helper.
     local legacy_args=d
@@ -212,6 +216,7 @@ ynh_psql_drop_user() {
 # After executing this helper, the password of the created database will be available in $db_pwd
 # It will also be stored as "psqlpwd" into the app settings.
 #
+# Requires YunoHost version 2.7.13 or higher.
 ynh_psql_setup_db() {
     # Declare an array to define the options of this helper.
     local legacy_args=unp
@@ -239,6 +244,8 @@ ynh_psql_setup_db() {
 # usage: ynh_psql_remove_db --db_user=user --db_name=name
 # | arg: -u, --db_user=     - Owner of the database
 # | arg: -n, --db_name=     - Name of the database
+#
+# Requires YunoHost version 2.7.13 or higher.
 ynh_psql_remove_db() {
     # Declare an array to define the options of this helper.
     local legacy_args=un
@@ -268,6 +275,8 @@ ynh_psql_remove_db() {
 # Please always call this script in install and restore scripts
 #
 # usage: ynh_psql_test_if_first_run
+#
+# Requires YunoHost version 2.7.13 or higher.
 ynh_psql_test_if_first_run() {
     if [ -f "$PSQL_ROOT_PWD_FILE" ]
     then
diff --git a/data/helpers.d/systemd b/data/helpers.d/systemd
index c718e50c2..5e67baf4d 100644
--- a/data/helpers.d/systemd
+++ b/data/helpers.d/systemd
@@ -14,7 +14,7 @@
 #   __APP__       by  $app
 #   __FINALPATH__ by  $final_path
 #
-# Requires YunoHost version 2.7.2 or higher.
+# Requires YunoHost version 2.7.11 or higher.
 ynh_add_systemd_config () {
     # Declare an array to define the options of this helper.
     local legacy_args=st
@@ -79,6 +79,8 @@ ynh_remove_systemd_config () {
 # | arg: -p, --log_path=     - Log file - Path to the log file. Default : /var/log/$app/$app.log
 # | arg: -t, --timeout=      - Timeout - The maximum time to wait before ending the watching. Default : 300 seconds.
 # | arg: -e, --length=       - Length of the error log : Default : 20
+#
+# Requires YunoHost version 3.5.0 or higher.
 ynh_systemd_action() {
     # Declare an array to define the options of this helper.
     local legacy_args=nalpte
@@ -179,6 +181,8 @@ ynh_systemd_action() {
 # (usually used in ynh_clean_setup scripts)
 #
 # usage: ynh_clean_check_starting
+#
+# Requires YunoHost version 3.5.0 or higher.
 ynh_clean_check_starting () {
     if [ -n "$pid_tail" ]
     then
diff --git a/data/helpers.d/user b/data/helpers.d/user
index 304658ff8..08b1b1d42 100644
--- a/data/helpers.d/user
+++ b/data/helpers.d/user
@@ -78,6 +78,8 @@ ynh_system_user_exists() {
 # usage: ynh_system_group_exists --group=group
 # | arg: -g, --group=   - the group to check
 # | exit: Return 1 if the group doesn't exist, 0 otherwise
+#
+# Requires YunoHost version 3.5.0.2 or higher.
 ynh_system_group_exists() {
     # Declare an array to define the options of this helper.
     local legacy_args=g
diff --git a/data/helpers.d/utils b/data/helpers.d/utils
index 13d3a5dcd..fb50305ce 100644
--- a/data/helpers.d/utils
+++ b/data/helpers.d/utils
@@ -16,6 +16,7 @@
 #
 # It prints a warning to inform that the script was failed, and execute the ynh_clean_setup function if used in the app script
 #
+# Requires YunoHost version 2.6.4 or higher.
 ynh_exit_properly () {
     local exit_code=$?
     if [ "$exit_code" -eq 0 ]; then