diff --git a/docs/develop/env.rst b/docs/develop/env.rst
index 88347a942e..063bff1f94 100644
--- a/docs/develop/env.rst
+++ b/docs/develop/env.rst
@@ -32,7 +32,7 @@ Setup for Nailgun Unit Tests
     sudo apt-get install python-dev python-pip python-psycopg2 python-jinja2
     sudo apt-get install python-paste python-yaml python-sqlalchemy python-kombu
     sudo apt-get install python-crypto python-simplejson python-webpy python-nose
-    sudo pip install fysom jsonschema
+    sudo pip install fysom jsonschema hacking==0.7
 
 #. Install and configure PostgreSQL database::
 
diff --git a/nailgun/run_tests.sh b/nailgun/run_tests.sh
index d81de12dd3..d0a8d59241 100755
--- a/nailgun/run_tests.sh
+++ b/nailgun/run_tests.sh
@@ -81,6 +81,9 @@ if [ $fail_first -eq 1 ]; then
 fi
 
 function run_flake8 {
+  # H302 - "import only modules. does not import a module" requires to import only modules and not functions
+  # H802 - first line of git commit commentary should be less than 50 characters
+  # urls.py,__init__.py - are exclude because they don't comply with pep standard
   flake8 --exclude=urls.py,__init__.py --ignore=H302,H802 --show-source --show-pep8 --count . || return 1
   echo "Flake8 check passed successfully."
 }
diff --git a/requirements-eggs.txt b/requirements-eggs.txt
index f7a94cf08b..5b85226272 100644
--- a/requirements-eggs.txt
+++ b/requirements-eggs.txt
@@ -24,4 +24,4 @@ tornado==3.0
 web.py==0.37
 wsgilog==0.3
 wsgiref==0.1.2
-hacking>=0.6,<0.8
\ No newline at end of file
+hacking==0.7
\ No newline at end of file