diff --git a/data/helpers.d/multimedia b/data/helpers.d/multimedia
index 7b379ad0f..2d43c2540 100644
--- a/data/helpers.d/multimedia
+++ b/data/helpers.d/multimedia
@@ -6,6 +6,8 @@ readonly MEDIA_DIRECTORY=/home/yunohost.multimedia
 # Initialize the multimedia directory system
 #
 # usage: ynh_multimedia_build_main_dir
+#
+# Requires YunoHost version 4.2 or higher.
 ynh_multimedia_build_main_dir() {
 
     ## Création du groupe multimedia
@@ -55,6 +57,7 @@ ynh_multimedia_build_main_dir() {
 #
 # This "directory" will be a symbolic link to a existing directory.
 #
+# Requires YunoHost version 4.2 or higher.
 ynh_multimedia_addfolder() {
 
     # Declare an array to define the options of this helper.
@@ -83,6 +86,7 @@ ynh_multimedia_addfolder() {
 #
 # | arg: -u, --user_name= - The name of the user which gain this access.
 #
+# Requires YunoHost version 4.2 or higher.
 ynh_multimedia_addaccess () {
 	# Declare an array to define the options of this helper.
     local legacy_args=u
diff --git a/data/helpers.d/php b/data/helpers.d/php
index ae9cb2ec5..40a023e9d 100644
--- a/data/helpers.d/php
+++ b/data/helpers.d/php
@@ -570,6 +570,7 @@ YNH_COMPOSER_VERSION=${YNH_COMPOSER_VERSION:-$YNH_DEFAULT_COMPOSER_VERSION}
 # | arg: -w, --workdir - The directory from where the command will be executed. Default $final_path.
 # | arg: -c, --commands - Commands to execute.
 #
+# Requires YunoHost version 4.2 or higher.
 ynh_composer_exec () {
     # Declare an array to define the options of this helper.
     local legacy_args=vwc
@@ -595,6 +596,7 @@ ynh_composer_exec () {
 # | arg: -a, --install_args - Additional arguments provided to the composer install. Argument --no-dev already include
 # | arg: -c, --composerversion - Composer version to install
 #
+# Requires YunoHost version 4.2 or higher.
 ynh_install_composer () {
     # Declare an array to define the options of this helper.
     local legacy_args=vwac