diff --git a/README.md b/README.md
deleted file mode 100644
index 17fa079..0000000
--- a/README.md
+++ /dev/null
@@ -1,31 +0,0 @@
-# pysitemap
-Sitemap generator
-
-## installing
-
-    pip install sitemap-generator
-    
-## requirements
-
-    asyncio
-    aiofile
-    aiohttp
-
-## example
-
-    import sys
-    import logging
-    from pysitemap import crawler
-    
-    if __name__ == '__main__':
-        if '--iocp' in sys.argv:
-            from asyncio import events, windows_events
-            sys.argv.remove('--iocp')
-            logging.info('using iocp')
-            el = windows_events.ProactorEventLoop()
-            events.set_event_loop(el)
-    
-        # root_url = sys.argv[1]
-        root_url = 'https://www.haikson.com'
-        crawler(root_url, out_file='sitemap.xml')
-
diff --git a/README.rst b/README.rst
new file mode 100644
index 0000000..146f689
--- /dev/null
+++ b/README.rst
@@ -0,0 +1,70 @@
+pysitemap
+=========
+
+Sitemap generator
+
+installing
+----------
+
+::
+
+    pip install sitemap-generator
+
+requirements
+------------
+
+::
+
+    asyncio
+    aiofile
+    aiohttp
+
+example
+-------
+
+::
+
+    import sys
+    import logging
+    from pysitemap import crawler
+
+    if __name__ == '__main__':
+        if '--iocp' in sys.argv:
+            from asyncio import events, windows_events
+            sys.argv.remove('--iocp')
+            logging.info('using iocp')
+            el = windows_events.ProactorEventLoop()
+            events.set_event_loop(el)
+
+        # root_url = sys.argv[1]
+        root_url = 'https://www.haikson.com'
+        crawler(root_url, out_file='sitemap.xml')
+
+TODO
+-----
+
+-  big sites with count of pages more then 100K will use more then 100MB
+   memory. Move queue and done lists into database. Write Queue and Done
+   backend classes based on
+-  Lists
+-  SQLite database
+-  Redis
+-  Write api for extending by user backends
+
+changelog
+---------
+
+v. 0.9.1
+''''''''
+
+-  extended readme
+-  docstrings and code commentaries
+
+v. 0.9.0
+''''''''
+
+-  since this version package supports only python version >=3.7
+-  all functions recreated but api saved. If You use this package, then
+   just update it, install requirements and run process
+-  all requests works asynchronously
+
diff --git a/setup.py b/setup.py
index 6457309..e2e74e9 100644
--- a/setup.py
+++ b/setup.py
@@ -1,4 +1,5 @@
 from setuptools import find_packages, setup
+from version import VERSION
 
 EXCLUDE_FROM_PACKAGES = ['tests',]
 
@@ -8,17 +9,10 @@ def get_requirements():
         requirements = df.readlines()
     return [requirement.strip() for requirement in requirements]
 
-def get_version(major=0, minor=0, build=0):
-    return '%s.%s.%s' % (major, minor, build)
-
 
 setup(
     name='sitemap-generator',
-    version=get_version(
-        major=0,
-        minor=9,
-        build=0,
-    ),
+    version=VERSION,
     packages=find_packages(exclude=EXCLUDE_FROM_PACKAGES),
     include_package_data=True,
     url='https://github.com/Haikson/sitemap-generator',
diff --git a/version.py b/version.py
new file mode 100644
index 0000000..7e91176
--- /dev/null
+++ b/version.py
@@ -0,0 +1 @@
+VERSION = '0.9.1'
\ No newline at end of file