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+# Rspamd documentation project
+
+## Introduction
+Rspamd is a fast and advanced spam filtering system. It is based on event-driven processing model
+allowing to work with multiple messages simultaneously without blocking anywhere during messages
+processing. Rspamd contains various modules shipped in the default distribution and permits to be
+extended with the own custom modules and rules written in [Lua](http://lua.org) programming language.
+Rspamd uses complex estimation system based on a set of rules, each of those rules has its own score and
+the final score of a message is defined by a sum of rules' scores that were true for that message. This approach
+is similar to other complex spam filtering systems, such as [SpamAssassin](http://spamassassin.apache.org).
+At the same time, rspamd uses fuzzy logic to process unknown messages. That includes fuzzy hashes and 
+statistics module.
+
+## Table of Contents
+This document contains the basic documentation for rspamd spam filtering system. It is divided into the following
+parts:
+
+- [Architecture](/architecture/) presents the architecture of rspamd and how spam filtering is performed
+- [Rspamd configuration](/configuration/) describes principles of rspamd configuration
+- [Modules](/modules/) chapter lists rspamd modules and defines their configuration attributes
+- [Workers](/workers/) section describes workers that are implemented in the rspamd
+- [Lua API](/lua/) explains how to extend rspamd with own lua modules
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