diff --git a/.readthedocs.yml b/.readthedocs.yml
new file mode 100644
index 0000000..aee7b78
--- /dev/null
+++ b/.readthedocs.yml
@@ -0,0 +1,12 @@
+version: 2
+
+sphinx:
+  configuration: docs/conf.py
+
+formats:
+  - pdf
+
+python:
+  version: 3.7
+  install:
+    - requirements: docs/requirements.txt
\ No newline at end of file
diff --git a/docs/conf.py b/docs/conf.py
index cfaaa9a..dd5f081 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -8,40 +8,55 @@
 # All configuration values have a default; values that are commented out
 # serve to show the default.
 
+import os
 import sys
+import inspect
+import shutil
+
+__location__ = os.path.join(os.getcwd(), os.path.dirname(
+    inspect.getfile(inspect.currentframe())))
 
 # If extensions (or modules to document with autodoc) are in another directory,
 # add these directories to sys.path here. If the directory is relative to the
 # documentation root, use os.path.abspath to make it absolute, like shown here.
-# sys.path.insert(0, os.path.abspath('.'))
+sys.path.insert(0, os.path.join(__location__, '../src'))
 
-# -- Hack for ReadTheDocs ------------------------------------------------
+# -- Run sphinx-apidoc ------------------------------------------------------
 # This hack is necessary since RTD does not issue `sphinx-apidoc` before running
 # `sphinx-build -b html . _build/html`. See Issue:
 # https://github.com/rtfd/readthedocs.org/issues/1139
 # DON'T FORGET: Check the box "Install your project inside a virtualenv using
 # setup.py install" in the RTD Advanced Settings.
-import os
-on_rtd = os.environ.get('READTHEDOCS', None) == 'True'
-if on_rtd:
-    import inspect
-    os.environ['SPHINX_APIDOC_OPTIONS'] = ','.join(['members',
-                                                    'undoc-members',
-                                                    'inherited-members',
-                                                    'show-inheritance'])
+# Additionally it helps us to avoid running apidoc manually
+
+try:  # for Sphinx >= 1.7
+    from sphinx.ext import apidoc
+except ImportError:
     from sphinx import apidoc
 
-    __location__ = os.path.join(os.getcwd(), os.path.dirname(
-        inspect.getfile(inspect.currentframe())))
+output_dir = os.path.join(__location__, "api")
+module_dir = os.path.join(__location__, "../src/gldas")
+try:
+    shutil.rmtree(output_dir)
+except FileNotFoundError:
+    pass
+
+try:
+    import sphinx
+    from pkg_resources import parse_version
 
-    output_dir = os.path.join(__location__, "../docs/api")
-    module_dir = os.path.join(__location__, "../gldas")
     cmd_line_template = "sphinx-apidoc -f -o {outputdir} {moduledir}"
-    cmd_line = cmd_line_template.format(
-        outputdir=output_dir, moduledir=module_dir)
-    apidoc.main(cmd_line.split(" "))
+    cmd_line = cmd_line_template.format(outputdir=output_dir, moduledir=module_dir)
+
+    args = cmd_line.split(" ")
+    if parse_version(sphinx.__version__) >= parse_version('1.7'):
+        args = args[1:]
 
-# -- General configuration -----------------------------------------------
+    apidoc.main(args)
+except Exception as e:
+    print("Running `sphinx-apidoc` failed!\n{}".format(e))
+
+# -- General configuration -----------------------------------------------------
 
 # If your documentation needs a minimal Sphinx version, state it here.
 # needs_sphinx = '1.0'
@@ -50,7 +65,7 @@
 # coming with Sphinx (named 'sphinx.ext.*') or your custom ones.
 extensions = ['sphinx.ext.autodoc', 'sphinx.ext.intersphinx', 'sphinx.ext.todo',
               'sphinx.ext.autosummary', 'sphinx.ext.viewcode', 'sphinx.ext.coverage',
-              'sphinx.ext.doctest', 'sphinx.ext.ifconfig', 'sphinx.ext.pngmath',
+              'sphinx.ext.doctest', 'sphinx.ext.ifconfig', 'sphinx.ext.mathjax',
               'sphinx.ext.napoleon']
 
 # Add any paths that contain templates here, relative to this directory.
@@ -67,7 +82,7 @@
 
 # General information about the project.
 project = u'gldas'
-copyright = u'2016, TU Wien'
+copyright = u'2020, TU Wien'
 
 # The version info for the project you're documenting, acts as replacement for
 # |version| and |release|, also used in various other places throughout the
@@ -116,7 +131,7 @@
 # keep_warnings = False
 
 
-# -- Options for HTML output ---------------------------------------------
+# -- Options for HTML output ---------------------------------------------------
 
 # The theme to use for HTML and HTML Help pages.  See the documentation for
 # a list of builtin themes.
@@ -125,7 +140,10 @@
 # Theme options are theme-specific and customize the look and feel of a theme
 # further.  For a list of options available for each theme, see the
 # documentation.
-# html_theme_options = {}
+html_theme_options = {
+    'sidebar_width': '300px',
+    'page_width': '1200px'
+}
 
 # Add any paths that contain custom themes here, relative to this directory.
 # html_theme_path = []
@@ -201,24 +219,24 @@
 htmlhelp_basename = 'gldas-doc'
 
 
-# -- Options for LaTeX output --------------------------------------------
+# -- Options for LaTeX output --------------------------------------------------
 
 latex_elements = {
-    # The paper size ('letterpaper' or 'a4paper').
-    # 'papersize': 'letterpaper',
+# The paper size ('letterpaper' or 'a4paper').
+# 'papersize': 'letterpaper',
 
-    # The font size ('10pt', '11pt' or '12pt').
-    # 'pointsize': '10pt',
+# The font size ('10pt', '11pt' or '12pt').
+# 'pointsize': '10pt',
 
-    # Additional stuff for the LaTeX preamble.
-    # 'preamble': '',
+# Additional stuff for the LaTeX preamble.
+# 'preamble': '',
 }
 
 # Grouping the document tree into LaTeX files. List of tuples
 # (source start file, target name, title, author, documentclass [howto/manual]).
 latex_documents = [
-    ('index', 'user_guide.tex', u'gldas Documentation',
-     u'TU Wien', 'manual'),
+  ('index', 'user_guide.tex', u'gldas Documentation',
+   u'TU Wien', 'manual'),
 ]
 
 # The name of an image file (relative to this directory) to place at the top of
@@ -241,14 +259,14 @@
 # If false, no module index is generated.
 # latex_domain_indices = True
 
-# -- External mapping ----------------------------------------------------
+# -- External mapping ------------------------------------------------------------
 python_version = '.'.join(map(str, sys.version_info[0:2]))
 intersphinx_mapping = {
-    'sphinx': ('http://sphinx.pocoo.org', None),
-    'python': ('http://docs.python.org/' + python_version, None),
-    'matplotlib': ('http://matplotlib.sourceforge.net', None),
-    'numpy': ('http://docs.scipy.org/doc/numpy', None),
+    'sphinx': ('http://www.sphinx-doc.org/en/stable', None),
+    'python': ('https://docs.python.org/' + python_version, None),
+    'matplotlib': ('https://matplotlib.org', None),
+    'numpy': ('https://docs.scipy.org/doc/numpy', None),
     'sklearn': ('http://scikit-learn.org/stable', None),
     'pandas': ('http://pandas.pydata.org/pandas-docs/stable', None),
-    'scipy': ('http://docs.scipy.org/doc/scipy/reference/', None),
-}
+    'scipy': ('https://docs.scipy.org/doc/scipy/reference', None),
+}
\ No newline at end of file
diff --git a/docs/requirements.txt b/docs/requirements.txt
new file mode 100644
index 0000000..52b04f2
--- /dev/null
+++ b/docs/requirements.txt
@@ -0,0 +1 @@
+sphinx_rtd_theme
\ No newline at end of file
diff --git a/src/gldas/interface.py b/src/gldas/interface.py
index dbf51a5..fa25966 100644
--- a/src/gldas/interface.py
+++ b/src/gldas/interface.py
@@ -442,5 +442,4 @@ def __init__(self, ts_path, grid_path=None, **kwargs):
             grid_path = os.path.join(ts_path, "grid.nc")
 
         grid = load_grid(grid_path)
-        super(GLDASTs, self).__init__(ts_path, grid, **kwargs)
-
+        super(GLDASTs, self).__init__(ts_path, grid, **kwargs)
\ No newline at end of file