Updated overview. Added licensing section

README.md

@@ -2,16 +2,20 @@ SLRE: Super Light Regular Expression library
 ============================================
 
 SLRE is an ISO C library that implements a subset of Perl regular
-expression syntax. Main focus of SLRE is small size, [simple
-API](https://github.com/cesanta/slre/blob/master/slre.h), clarity of code
-and extensibility. It is making it perfect for tasks like parsing network
-requests, configuration files, user input, etc, when libraries like
-[PCRE](http://pcre.org) are too heavyweight for the given task. Developers in
-embedded would benefit most.
+expression syntax. Main features of SLRE are:
 
-Extensibility is another great aspect of SLRE.  For example, if one wants to
-introduce a new metacharacter, '\i', meaning 'IPv4 address', it is easy to do
-so with SLRE.
+   * Written in strict ISO C, conforming to ANSI C'89
+   * Small size (compiled x86 code is about 4kB)
+   * Uses no dynamic memory allocation and small stack space
+   * [Simple API](https://github.com/cesanta/slre/blob/master/slre.h)
+   * Implements most useful subset of Perl regex syntax (see below)
+   * Easily extensible. For example, if one wants to introduce a new
+metacharacter `\i`, meaning "IPv4 address", it is easy to do so with SLRE.
+
+SLRE is perfect for tasks like parsing network requests, configuration
+files, user input, etc, when libraries like [PCRE](http://pcre.org) are too
+heavyweight for the given task. Developers of embedded systems would benefit
+most.
 
 ## Supported Syntax
 
@@ -71,3 +75,11 @@ which should be an array of following structures:
     } else {
       printf("Error parsing [%s]: [%s]\n", request, error_msg);
     }
+
+# Licensing
+
+SLRE is dual licensed. It is available either under the terms of [GNU GPL
+v.2 license](http://www.gnu.org/licenses/old-licenses/gpl-2.0.html) for
+free, or under the terms of standard commercial license provided by [Cesanta
+Software](http://cesanta.com). Businesses who whish to use Cesanta's products
+must [license commercial version](http://cesanta.com/products.html).