diff --git a/scripts/upgrade b/scripts/upgrade
index accab23..bfaec82 100755
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -41,11 +41,13 @@ if [ -z "${fpm_free_footprint:-}" ]; then
 	ynh_app_setting_set --app=$app --key=fpm_free_footprint --value=$fpm_free_footprint
 fi
 
+# If fpm_usage doesn't exist, create it
 if [ -z "${fpm_usage:-}" ]; then
 	fpm_usage=medium
 	ynh_app_setting_set --app=$app --key=fpm_usage --value=$fpm_usage
 fi
 
+# If phpflags doesn't exist, create it
 if [ -z "${phpflags:-}" ]; then
 	phpflags="--define apc.enable_cli=1"
 	ynh_app_setting_set --app=$app --key=phpflags --value=$phpflags