diff --git a/scripts/_common.sh b/scripts/_common.sh
index 7e55ac0..04b61bb 100644
--- a/scripts/_common.sh
+++ b/scripts/_common.sh
@@ -3,9 +3,25 @@
 #=================================================
 # COMMON VARIABLES
 #=================================================
+# PHP APP SPECIFIC
+#=================================================
+# Depending on its version, YunoHost uses different default PHP version:
+## YunoHost version "11.X" => PHP 7.4
+## YunoHost version "4.X"  => PHP 7.3
+#
+# This behaviour can be overridden by setting the YNH_PHP_VERSION variable
+#YNH_PHP_VERSION=7.3
+#YNH_PHP_VERSION=7.4
+#YNH_PHP_VERSION=8.0
+# For more information, see the PHP application helper: https://github.com/YunoHost/yunohost/blob/dev/helpers/php#L3-L6
+# Or this app package depending on PHP: https://github.com/YunoHost-Apps/grav_ynh/blob/master/scripts/_common.sh
+# PHP dependencies used by the app (must be on a single line)
+#php_dependencies="php$YNH_PHP_VERSION-deb1 php$YNH_PHP_VERSION-deb2"
+# or, if you do not need a custom YNH_PHP_VERSION:
+php_dependencies="php$YNH_DEFAULT_PHP_VERSION-deb1 php$YNH_DEFAULT_PHP_VERSION-deb2"
 
-# dependencies used by the app
-pkg_dependencies="deb1 deb2 php$YNH_DEFAULT_PHP_VERSION-deb1 php$YNH_DEFAULT_PHP_VERSION-deb2"
+# dependencies used by the app (must be on a single line)
+pkg_dependencies="deb1 deb2 $php_dependencies"
 
 #=================================================
 # PERSONAL HELPERS