diff --git a/README.md b/README.md
index 55fe422..13b37e7 100644
--- a/README.md
+++ b/README.md
@@ -17,20 +17,16 @@ A PowerDNS web interface with advanced features.
 - Dashboard and pdns service statistics
 - DynDNS 2 protocol support
 - Edit IPv6 PTRs using IPv6 addresses directly (no more editing of literal addresses!)
-- limited API for manipulating zones and records
+- Limited API for manipulating zones and records
 
 ### Running PowerDNS-Admin
 There are several ways to run PowerDNS-Admin. Following is a simple way to start PowerDNS-Admin using Docker
 
-Step 1: Build docker image
+Step 1: Update the configuration
 
-```$ docker-compose build```
+Edit the `docker-compose.yml` file to update the database connection string in `SQLALCHEMY_DATABASE_URI`. Other environment variables are mentioned in the [legal_envvars](https://github.com/ngoduykhanh/PowerDNS-Admin/blob/master/configs/docker_config.py#L5-L37).
 
-Step 2: Change the configuration
-
-Edit the `docker-compose.yml` file to update the database connection string in `SQLALCHEMY_DATABASE_URI`.
-
-Step 3: Start docker container
+Step 2: Start docker container
 
 ```$ docker-compose up```
 
diff --git a/powerdnsadmin/__init__.py b/powerdnsadmin/__init__.py
index 3f7c17a..38c82ff 100755
--- a/powerdnsadmin/__init__.py
+++ b/powerdnsadmin/__init__.py
@@ -49,7 +49,7 @@ def create_app(config=None):
     # HSTS
     if app.config.get('HSTS_ENABLED'):
         from flask_sslify import SSLify
-        _sslify = SSLify(app) # lgtm [py/unused-import]
+        _sslify = SSLify(app)  # lgtm [py/unused-local-variable]
 
     # Load app's components
     assets.init_app(app)
diff --git a/powerdnsadmin/decorators.py b/powerdnsadmin/decorators.py
index 1486928..d34af32 100644
--- a/powerdnsadmin/decorators.py
+++ b/powerdnsadmin/decorators.py
@@ -131,7 +131,7 @@ def api_basic_auth(f):
                     abort(401)
                 else:
                     user = User.query.filter(User.username == username).first()
-                    current_user = user
+                    current_user = user  # lgtm [py/unused-local-variable]
             except Exception as e:
                 current_app.logger.error('Error: {0}'.format(e))
                 abort(401)
diff --git a/powerdnsadmin/models/__init__.py b/powerdnsadmin/models/__init__.py
index 714a198..1562319 100644
--- a/powerdnsadmin/models/__init__.py
+++ b/powerdnsadmin/models/__init__.py
@@ -20,4 +20,4 @@ from .record_entry import RecordEntry
 
 def init_app(app):
     db.init_app(app)
-    _migrate = Migrate(app, db)  # lgtm [py/unused-import]
+    _migrate = Migrate(app, db)  # lgtm [py/unused-local-variable]
diff --git a/powerdnsadmin/models/domain.py b/powerdnsadmin/models/domain.py
index 31a2cbe..6ce1741 100644
--- a/powerdnsadmin/models/domain.py
+++ b/powerdnsadmin/models/domain.py
@@ -287,8 +287,7 @@ class Domain(db.Model):
             account_id = None
         # add new domain
         d = Domain()
-        d.name = domain['name'].rstrip(
-            '.')  # lgtm [py/modification-of-default-value]
+        d.name = domain['name'].rstrip('.')  # lgtm [py/modification-of-default-value]
         d.master = str(domain['masters'])
         d.type = domain['kind']
         d.serial = domain['serial']