diff --git a/docs/changelog.py b/docs/changelog.py
new file mode 100644
index 0000000..6742201
--- /dev/null
+++ b/docs/changelog.py
@@ -0,0 +1,139 @@
+"""
+Script to generate contributor and pull request lists
+
+This script generates contributor and pull request lists for release
+changelogs using Github v3 protocol. Use requires an authentication token in
+order to have sufficient bandwidth, you can get one following the directions at
+`<https://help.github.com/articles/creating-an-access-token-for-command-line-use/>_
+Don't add any scope, as the default is read access to public information. The
+token may be stored in an environment variable as you only get one chance to
+see it.
+
+Usage::
+
+    $ python ./docs/changelog.py <token> <revision range>
+
+The output is utf8 rst.
+
+Dependencies
+------------
+
+- gitpython
+- pygithub
+
+This script comes from Numpy:
+https://github.com/numpy/numpy/blob/master/tools/changelog.py
+
+Examples
+--------
+
+From the bash command line with $GITHUB token::
+
+    $ ./docs/changelog.py $GITHUB 1.4.0..master
+
+"""
+
+import os
+import re
+from git import Repo
+from github import Github
+
+this_repo = Repo(os.path.join(os.path.dirname(__file__), ".."))
+
+author_msg = """
+A total of %d people contributed to this release.  People with a "+" by their
+names contributed a patch for the first time.
+"""
+
+pull_request_msg = """
+A total of %d pull requests were merged for this release.
+"""
+
+
+def get_authors(revision_range):
+    pat = u'^.*\\t(.*)$'
+    lst_release, cur_release = [r.strip() for r in revision_range.split('..')]
+
+    # authors, in current release and previous to current release.
+    cur = set(re.findall(pat, this_repo.git.shortlog('-s', revision_range),
+                         re.M))
+    pre = set(re.findall(pat, this_repo.git.shortlog('-s', lst_release),
+                         re.M))
+
+    # Append '+' to new authors.
+    authors = [s + u' +' for s in cur - pre] + [s for s in cur & pre]
+    authors.sort()
+    return authors
+
+
+def get_pull_requests(repo, revision_range):
+    prnums = []
+
+    # From regular merges
+    merges = this_repo.git.log(
+        '--oneline', '--merges', revision_range)
+    issues = re.findall(u"Merge pull request \\#(\\d*)", merges)
+    prnums.extend(int(s) for s in issues)
+
+    # From Homu merges (Auto merges)
+    issues = re. findall(u"Auto merge of \\#(\\d*)", merges)
+    prnums.extend(int(s) for s in issues)
+
+    # From fast forward squash-merges
+    commits = this_repo.git.log(
+        '--oneline', '--no-merges', '--first-parent', revision_range)
+    issues = re.findall(u'^.*\\(\\#(\\d+)\\)$', commits, re.M)
+    prnums.extend(int(s) for s in issues)
+
+    # get PR data from github repo
+    prnums.sort()
+    prs = [repo.get_pull(n) for n in prnums]
+    return prs
+
+
+def main(token, revision_range):
+    lst_release, cur_release = [r.strip() for r in revision_range.split('..')]
+
+    github = Github(token)
+    github_repo = github.get_repo('saimn/sigal')
+
+    # document authors
+    authors = get_authors(revision_range)
+    heading = u"Contributors"
+    print()
+    print(heading)
+    print("=" * len(heading))
+    print(author_msg % len(authors))
+
+    for s in authors:
+        print(u'* ' + s)
+
+    # document pull requests
+    pull_requests = get_pull_requests(github_repo, revision_range)
+    heading = u"Pull requests merged"
+    pull_msg = u"* `#{0} <{1}>`__: {2}"
+
+    print()
+    print(heading)
+    print("=" * len(heading))
+    print(pull_request_msg % len(pull_requests))
+
+    for pull in pull_requests:
+        title = re.sub(u"\\s+", u" ", pull.title.strip())
+        if len(title) > 60:
+            remainder = re.sub(u"\\s.*$", u"...", title[60:])
+            if len(remainder) > 20:
+                remainder = title[:80] + u"..."
+            else:
+                title = title[:60] + remainder
+        print(pull_msg.format(pull.number, pull.html_url, title))
+
+
+if __name__ == "__main__":
+    from argparse import ArgumentParser
+
+    parser = ArgumentParser(description="Generate author/pr lists for release")
+    parser.add_argument('token', help='github access token')
+    parser.add_argument('revision_range', help='<revision>..<revision>')
+    args = parser.parse_args()
+    main(args.token, args.revision_range)