diff --git a/pythonbundles.py b/pythonbundles.py
index 96e817e..6242e20 100755
--- a/pythonbundles.py
+++ b/pythonbundles.py
@@ -22,26 +22,27 @@ import pythondistdeps
 pythondistdeps.parse_version = parse_version
 
 
-def generate_bundled_provides(path, namespace):
+def generate_bundled_provides(paths, namespace):
     provides = set()
 
-    for line in path.read_text().splitlines():
-        line, _, comment = line.partition('#')
-        if comment.startswith('egg='):
-            # not a real comment
-            # e.g. git+https://github.com/monty/spam.git@master#egg=spam&...
-            egg, *_ = comment.strip().partition(' ')
-            egg, *_ = egg.strip().partition('&')
-            name = pythondistdeps.normalize_name(egg[4:])
-            provides.add(f'Provides: bundled({namespace}({name}))')
-            continue
-        line = line.strip()
-        if line:
-            name, _, version = line.partition('==')
-            name = pythondistdeps.normalize_name(name)
-            bundled_name = f"bundled({namespace}({name}))"
-            python_provide = pythondistdeps.convert(bundled_name, '==', version)
-            provides.add(f'Provides: {python_provide}')
+    for path in paths:
+        for line in path.read_text().splitlines():
+            line, _, comment = line.partition('#')
+            if comment.startswith('egg='):
+                # not a real comment
+                # e.g. git+https://github.com/monty/spam.git@master#egg=spam&...
+                egg, *_ = comment.strip().partition(' ')
+                egg, *_ = egg.strip().partition('&')
+                name = pythondistdeps.normalize_name(egg[4:])
+                provides.add(f'Provides: bundled({namespace}({name}))')
+                continue
+            line = line.strip()
+            if line:
+                name, _, version = line.partition('==')
+                name = pythondistdeps.normalize_name(name)
+                bundled_name = f"bundled({namespace}({name}))"
+                python_provide = pythondistdeps.convert(bundled_name, '==', version)
+                provides.add(f'Provides: {python_provide}')
 
     return provides
 
@@ -70,7 +71,7 @@ if __name__ == '__main__':
 
     parser = argparse.ArgumentParser(prog=sys.argv[0],
                                      formatter_class=argparse.ArgumentDefaultsHelpFormatter)
-    parser.add_argument('vendored', metavar='VENDORED.TXT',
+    parser.add_argument('vendored', metavar='VENDORED.TXT', nargs='+', type=pathlib.Path,
                         help='Upstream information about vendored libraries')
     parser.add_argument('-c', '--compare-with', action='store',
                         help='A string value to compare with and verify')
@@ -78,7 +79,7 @@ if __name__ == '__main__':
                         help='What namespace of provides will used', default='python3dist')
     args = parser.parse_args()
 
-    provides = generate_bundled_provides(pathlib.Path(args.vendored), args.namespace)
+    provides = generate_bundled_provides(args.vendored, args.namespace)
 
     if args.compare_with:
         given = args.compare_with.splitlines()
diff --git a/tests/data/scripts_pythonbundles/pkg_resources_setuptools.out b/tests/data/scripts_pythonbundles/pkg_resources_setuptools.out
new file mode 100644
index 0000000..cc2d710
--- /dev/null
+++ b/tests/data/scripts_pythonbundles/pkg_resources_setuptools.out
@@ -0,0 +1,5 @@
+Provides: bundled(python3dist(appdirs)) = 1.4.3
+Provides: bundled(python3dist(ordered-set)) = 3.1.1
+Provides: bundled(python3dist(packaging)) = 16.8
+Provides: bundled(python3dist(pyparsing)) = 2.2.1
+Provides: bundled(python3dist(six)) = 1.10
diff --git a/tests/data/scripts_pythonbundles/setuptools.in b/tests/data/scripts_pythonbundles/setuptools.in
new file mode 100644
index 0000000..d7d2beb
--- /dev/null
+++ b/tests/data/scripts_pythonbundles/setuptools.in
@@ -0,0 +1,3 @@
+packaging==16.8
+pyparsing==2.2.1
+ordered-set==3.1.1
diff --git a/tests/data/scripts_pythonbundles/setuptools.out b/tests/data/scripts_pythonbundles/setuptools.out
new file mode 100644
index 0000000..0acb887
--- /dev/null
+++ b/tests/data/scripts_pythonbundles/setuptools.out
@@ -0,0 +1,3 @@
+Provides: bundled(python3dist(ordered-set)) = 3.1.1
+Provides: bundled(python3dist(packaging)) = 16.8
+Provides: bundled(python3dist(pyparsing)) = 2.2.1
diff --git a/tests/test_scripts_pythonbundles.py b/tests/test_scripts_pythonbundles.py
index c04230e..2926713 100644
--- a/tests/test_scripts_pythonbundles.py
+++ b/tests/test_scripts_pythonbundles.py
@@ -34,7 +34,7 @@ def run_pythonbundles(*args, success=True):
     return cp
 
 
-projects = pytest.mark.parametrize('project', ('pkg_resources', 'pip', 'pipenv'))
+projects = pytest.mark.parametrize('project', ('pkg_resources', 'pip', 'pipenv', 'setuptools'))
 
 
 @projects
@@ -97,3 +97,23 @@ def test_compare_with_unexpected(project):
     cp = run_pythonbundles(TEST_DATA / f'{project}.in', '--compare-with', longer, success=False)
     assert cp.stdout == '', cp.stdout
     assert cp.stderr == f'Redundant unexpected provides:\n    + {unexpected}\n', cp.stderr
+
+
+combo_order = pytest.mark.parametrize('projects', ['pkg_resources-setuptools', 'setuptools-pkg_resources'])
+
+
+@combo_order
+def test_multiple_vendor_files_output(projects):
+    cp = run_pythonbundles(*(TEST_DATA / f'{p}.in' for p in projects.split('-')))
+    expected = (TEST_DATA / 'pkg_resources_setuptools.out').read_text()
+    assert cp.stdout == expected, cp.stdout
+    assert cp.stderr == '', cp.stderr
+
+
+@combo_order
+def test_multiple_vendor_files_compare_with(projects):
+    expected = (TEST_DATA / 'pkg_resources_setuptools.out').read_text()
+    cp = run_pythonbundles(*(TEST_DATA / f'{p}.in' for p in projects.split('-')),
+                           '--compare-with', expected)
+    assert cp.stdout == '', cp.stdout
+    assert cp.stderr == '', cp.stderr