diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index a6b91a52ab..4380612287 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -57,8 +57,9 @@ Make sure to [keep your fork up to date][link_updateupstreamwiki] with the maste
 If you're adding a new tool from an existing neuroimaging toolkit (e.g., 3dDeconvolve from AFNI), check out the [guide for adding new interfaces to Nipype][link_new_interfaces].
 
 To confirm that your changes worked as intended, [clone your fork][link_cloning] to create a local directory.
-In this local directory, run `python setup.py develop`.
-This will add your version of nipype to your local python environment.
+In this local directory, run `pip install -e .[dev]`.
+This will add your version of nipype to your local python environment and
+install dependencies needed for development.
 
 Then, in this local nipype directory, run `make check-before-commit`. If you get no errors, you're ready to submit your changes!
 
diff --git a/nipype/info.py b/nipype/info.py
index 7cee71d6bd..0964d69dbf 100644
--- a/nipype/info.py
+++ b/nipype/info.py
@@ -167,7 +167,15 @@ def get_nipype_gitversion():
     # 'mesh': ['mayavi']  # Enable when it works
 }
 
+
+def _list_union(iterable):
+    return list(set(sum(iterable, [])))
+
+
 # Enable a handle to install all extra dependencies at once
-EXTRA_REQUIRES['all'] = [val for _, val in list(EXTRA_REQUIRES.items())]
+EXTRA_REQUIRES['all'] = _list_union(EXTRA_REQUIRES.values())
+# dev = doc + tests + specs
+EXTRA_REQUIRES['dev'] = _list_union(val for key, val in EXTRA_REQUIRES.items()
+                                    if key in ('doc', 'tests', 'specs'))
 
 STATUS = 'stable'