diff --git a/conf/config.php b/conf/config.php
index 2a3521f..e28b566 100644
--- a/conf/config.php
+++ b/conf/config.php
@@ -25,6 +25,56 @@
 	// You need to set this option correctly otherwise several features
 	// including PUSH, bookmarklets and browser integration will not work properly.
 
+	//putenv('TTRSS_FEED_CRYPT_KEY', '');
+	// WARNING: mcrypt is deprecated in php 7.1. This directive exists for backwards
+	// compatibility with existing installs, new passwords are NOT going to be encrypted.
+	// Use update.php --decrypt-feeds to decrypt existing passwords in the database while
+	// mcrypt is still available.
+
+	// Key used for encryption of passwords for password-protected feeds
+	// in the database. A string of 24 random characters. If left blank, encryption
+	// is not used. Requires mcrypt functions.
+	// Warning: changing this key will make your stored feed passwords impossible
+	// to decrypt.
+
+	putenv('TTRSS_SINGLE_USER_MODE=true');
+	// Operate in single user mode, disables all functionality related to
+	// multiple users and authentication. Enabling this assumes you have
+	// your tt-rss directory protected by other means (e.g. http auth).
+
+	putenv('TTRSS_SIMPLE_UPDATE_MODE=false');
+	// Enables fallback update mode where tt-rss tries to update feeds in
+	// background while tt-rss is open in your browser. 
+	// If you don't have a lot of feeds and don't want to or can't run 
+	// background processes while not running tt-rss, this method is generally 
+	// viable to keep your feeds up to date.
+	// Still, there are more robust (and recommended) updating methods 
+	// available, you can read about them here: http://tt-rss.org/wiki/UpdatingFeeds
+
+	// *****************************
+	// *** Files and directories ***
+	// *****************************
+
+	putenv('TTRSS_PHP_EXECUTABLE=/usr/bin/php');
+	// Path to PHP *COMMAND LINE* executable, used for various command-line tt-rss 
+	// programs and update daemon. Do not try to use CGI binary here, it won't work. 
+	// If you see HTTP headers being displayed while running tt-rss scripts, 
+	// then most probably you are using the CGI binary. If you are unsure what to 
+	// put in here, ask your hosting provider.
+
+	define('TTRSS_LOCK_DIRECTORY=lock');
+	// Directory for lockfiles, must be writable to the user you run
+	// daemon process or cronjobs under.
+
+	define('TTRSS_CACHE_DIR=cache');
+	// Local cache directory for RSS feed content.
+
+	define('TTRSS_ICONS_DIR=feed-icons');
+	define('TTRSS_ICONS_URL=feed-icons');
+	// Local and URL path to the directory, where feed favicons are stored.
+	// Unless you really know what you're doing, please keep those relative
+	// to tt-rss main directory.
+
 	//putenv('TTRSS_SIMPLE_UPDATE_MODE=true');
 
 	// **********************
@@ -43,6 +93,36 @@
 	// If set to true, users won't be able to set application language
 	// and settings profile.
 
+	// *********************
+	// *** Feed settings ***
+	// *********************
+
+	putenv('TTRSS_FORCE_ARTICLE_PURGE=0');
+	// When this option is not 0, users ability to control feed purging
+	// intervals is disabled and all articles (which are not starred) 
+	// older than this amount of days are purged.
+
+	// *** PubSubHubbub settings ***
+
+	putenv('TTRSS_PUBSUBHUBBUB_HUB', '');
+	// URL to a PubSubHubbub-compatible hub server. If defined, "Published
+	// articles" generated feed would automatically become PUSH-enabled.
+
+	putenv('TTRSS_PUBSUBHUBBUB_ENABLED=false');
+	// Enable client PubSubHubbub support in tt-rss. When disabled, tt-rss
+	// won't try to subscribe to PUSH feed updates.
+
+	// ****************************
+	// *** Sphinx search plugin ***
+	// ****************************
+
+	putenv('TTRSS_SPHINX_SERVER=localhost:9312');
+	// Hostname:port combination for the Sphinx server.
+
+	putenv('TTRSS_SPHINX_INDEX=ttrss, delta');
+	// Index name in Sphinx configuration. You can specify multiple indexes
+	// as a comma-separated string.
+	// Example configuration files are available on tt-rss wiki.
 
 	// ***********************************
 	// *** Self-registrations by users ***