diff --git a/README.md b/README.md
index 994aa02..551a8d5 100644
--- a/README.md
+++ b/README.md
@@ -31,7 +31,12 @@ Utility to import data into ClickHouse from MySQL (mainly) and/or CSV files
 
 Data reader requires **Python 3.x** with additional modules to be installed.
 
-`mysql-replication` package is used for communication with MySQL:
+`MySQLdb` package is used for communication with MySQL:
+```bash
+pip install mysqlclient
+```
+
+`mysql-replication` package is used for communication with MySQL also:
 [https://github.com/noplay/python-mysql-replication](https://github.com/noplay/python-mysql-replication)
 ```bash
 pip install mysql-replication
@@ -43,6 +48,7 @@ pip install mysql-replication
 pip install clickhouse-driver
 ```
 
+
 Also the following (at least one of) MySQL privileges are required for this operation: `SUPER`, `REPLICATION CLIENT` 
 
 ```mysql
@@ -133,7 +139,7 @@ Options description
 # Performance
 
 `pypy` significantly improves performance. You should try it.
-For example you can start with [Portable PyPy distribution for Linux](https://github.com/squeaky-pl/portable-pypy#portable-pypy-distribution-for-linux)
+For example you can start with [Portable PyPy distribution for Linux](https://github.com/squeaky-pl/portable-pypy#portable-pypy-distribution-for-linux) - use (Python 3.x release)[https://github.com/squeaky-pl/portable-pypy#latest-python-35-release]
 Unpack it into your place of choice.
 
 ```bash
@@ -159,6 +165,17 @@ Install required modules
 pypy3.5-5.9-beta-linux_x86_64-portable/bin/pip3 install mysql-replication
 pypy3.5-5.9-beta-linux_x86_64-portable/bin/pip3 install clickhouse-driver
 ```
+`mysqlclient` may require to install `libmysqlclient-dev` and `gcc`
+```bash
+pypy3.5-5.9-beta-linux_x86_64-portable/bin/pip3 install mysqlclient
+```
+Install them if need be
+```bash
+sudo apt-get install libmysqlclient-dev
+```
+```bash
+sudo apt-get install gcc
+```
 
 Now you can run data reader via `pypy`
 ```bash
diff --git a/src/tablebuilder.py b/src/tablebuilder.py
index 7a7937a..1f4f93e 100644
--- a/src/tablebuilder.py
+++ b/src/tablebuilder.py
@@ -17,7 +17,7 @@ class TableBuilder(object):
     dbs = None
     tables = None
 
-    def __init__(self, host, port, user, password=None, dbs=None, tables=None):
+    def __init__(self, host=None, port=None, user=None, password=None, dbs=None, tables=None):
         self.host = host
         self.port = port
         self.user = user
@@ -221,14 +221,15 @@ def map_type(self, mysql_type, nullable=False):
         return ch_type
 
 if __name__ == '__main__':
-    tb = TableBuilder()
-    templates = tb.templates(
+    tb = TableBuilder(
         host='127.0.0.1',
         user='reader',
         password='qwerty',
-        db='db',
-#        tables='datatypes, enum_datatypes, json_datatypes',
+        dbs=['db'],
+        #        tables='datatypes, enum_datatypes, json_datatypes',
         tables=['datatypes', 'enum_datatypes', 'json_datatypes'],
     )
-    for table in templates:
-        print(table, '=', templates[table])
+    templates = tb.templates()
+    for db in templates:
+        for table in templates[db]:
+            print(table, '=', templates[db][table])