diff --git a/openstack_requirements/cmds/normalize_requirements.py b/openstack_requirements/cmds/normalize_requirements.py
index dad7721285..dfac9419bb 100644
--- a/openstack_requirements/cmds/normalize_requirements.py
+++ b/openstack_requirements/cmds/normalize_requirements.py
@@ -16,21 +16,40 @@ from __future__ import print_function
 from __future__ import unicode_literals
 
 import argparse
+import os.path
+
 from openstack_requirements import requirement
 
 
+def write_requirements_file(filename, reqs):
+    with open(filename + 'tmp', 'wt') as f:
+        f.write(reqs)
+    if os.path.exists(filename):
+        os.remove(filename)
+    os.rename(filename + 'tmp', filename)
+
+
 def main():
     parser = argparse.ArgumentParser(
         description="Normalize requirements files")
     parser.add_argument('requirements', help='requirements file input')
+    parser.add_argument('-s', '--save', action='store_true', default=False,
+                        help=('save normalized requirements '
+                              'file instead of displaying it'))
     args = parser.parse_args()
     with open(args.requirements) as f:
         requirements = [line.strip() for line in f.readlines()]
 
+    normed_reqs = ""
     for line in requirements:
         req = requirement.parse_line(line)
-        print(req.to_line(comment_prefix='  ',
-                          sort_specifiers=True), end='')
+        normed_req = req.to_line(comment_prefix='  ', sort_specifiers=True)
+        normed_reqs += normed_req
+
+    if args.save:
+        write_requirements_file(args.requirements, normed_reqs)
+    else:
+        print(normed_reqs, end='')
 
 
 if __name__ == '__main__':