diff --git a/README.md b/README.md
index f4fe714..c957f55 100644
--- a/README.md
+++ b/README.md
@@ -92,9 +92,6 @@ or
 
 ```George Forman, "An Extensive Empirical Study of Feature Selection Metrics for Text Classification",Journal of Machine Learning Research 3 (2003) 1289-1305```
  
- 
-
-
 
 # Requirement
 
@@ -107,6 +104,21 @@ or
 
 `python setup.py install`
 
+### Note
+
+You might see error message during running this command, such as
+
+```
+We failed to install numpy automatically. Try installing numpy manually or Try anaconda distribution.
+```
+
+This is because `setup.py` tries to instal numpy and scipy with `pip`, however it fails. 
+We need numpy and scipy before we install `scikit-learn`.
+
+In this case, you take following choice
+
+* You install `numpy` and `scipy` manually
+* You use `anaconda` python distribution. Please visit [their site](https://www.continuum.io/downloads).
 
 # Examples
 
@@ -157,4 +169,6 @@ Removed a bug when calling n_gram method of DataConverter
 * Resolved bottleneck poins in pre-processing
     * Introduced dict-vectorising in ScikitLearn
     * Introduced Cython in calculating PMI \& SOA. You can call them with `use_cython=True` flag. See `examples/example_python3.py`
-
+* Performance
+    * Cython PMI takes 11.87 sec.
+    * Python multiprocessing PMI takes 513.541 sec. (8.55 min.)
\ No newline at end of file
diff --git a/setup.py b/setup.py
index 2e6fef7..b3e21f9 100644
--- a/setup.py
+++ b/setup.py
@@ -6,15 +6,16 @@
 __version__ = '1.3'
 
 import sys
+import pip
 from setuptools import setup, find_packages
+from distutils.extension import Extension
+
 
-# Flags to compile Cython code or use already compiled code
 # --------------------------------------------------------------------------------------------------------
+# Flags to compile Cython code or use already compiled code
 try:
     from Cython.Build import cythonize
-    from distutils.extension import Extension
     from Cython.Distutils import build_ext
-    import numpy
 except ImportError:
     use_cython = False
 else:
@@ -32,14 +33,34 @@
     ext_modules += [
         Extension("DocumentFeatureSelection.pmi.pmi_cython", [ "DocumentFeatureSelection/pmi/pmi_cython.c" ]),
     ]
-# --------------------------------------------------------------------------------------------------------
 
+# --------------------------------------------------------------------------------------------------------
+# try to install numpy automatically because sklearn requires the status where numpy is already installed
+try:
+    import numpy
+except ImportError:
+    use_numpy_include_dirs = False
+    try:
+        pip.main(['install', 'numpy'])
+    except:
+        raise Exception('We failed to install numpy automatically. Try installing numpy manually or Try anaconda distribution.')
+# --------------------------------------------------------------------------------------------------------
+# try to install scipy automatically because sklearn requires the status where scipy is already installed
+try:
+    import scipy
+except ImportError:
+    use_numpy_include_dirs = False
+    try:
+        pip.main(['install', 'scipy'])
+    except:
+        raise Exception('We failed to install scipy automatically. Try installing scipy manually or Try anaconda distribution.')
+# --------------------------------------------------------------------------------------------------------
 
 python_version = sys.version_info
 
 if python_version >= (3, 0, 0):
-    install_requires = ['six', 'setuptools>=1.0', 'joblib',
-                        'scipy', 'nltk', 'scikit-learn', 'numpy', 'pypandoc', 'cython', 'scikit-learn']
+    install_requires = ['six', 'setuptools>=1.0', 'joblib', 'numpy',
+                        'scipy', 'nltk', 'scikit-learn', 'pypandoc', 'cython']
 else:
     raise Exception('This package does NOT support Python2.x')
 
@@ -75,7 +96,8 @@
     zip_safe=False,
     test_suite='tests.all_tests.suite',
     install_requires=install_requires,
-    setup_requires=['six', 'setuptools>=1.0'],
+    tests_require=install_requires,
+    setup_requires=['six', 'setuptools>=1.0', 'pip'],
     classifiers=[],
     cmdclass=cmdclass,
     ext_modules=ext_modules,