improve install docs

README.md

@@ -12,7 +12,11 @@ of your php version. It might look as follows.
 ```shell
 PHP_VERSION=`php -r "echo PHP_MAJOR_VERSION . '.' . PHP_MINOR_VERSION;"`
 PHP_EXTENSION_DIR=`php -r "echo ini_get('extension_dir');"`
+
+# download the extension file into the extension dir 
 curl -o "${PHP_EXTENSION_DIR}/libphp_ext_fs_notify.so" "https://github.com/genkgo/php-ext-fs-notify/releases/latest/download/linux-php${PHP_VERSION}-libphp_ext_fs_notify.so"
+
+# enable the extension
 echo 'extension=libphp_ext_fs_notify.so' > /etc/php/${PHP_VERSION}/cli/conf.d/20-libphp_ext_fs_notify.ini
 ```