diff --git a/.gitignore b/.gitignore
index 612accb7..97e12f37 100644
--- a/.gitignore
+++ b/.gitignore
@@ -11,3 +11,4 @@ tests/data/repo-krb5-lookaside
 tests/_composes
 htmlcov/
 .coverage
+.idea/
diff --git a/pungi/phases/pkgset/sources/source_koji.py b/pungi/phases/pkgset/sources/source_koji.py
index 0217ef99..19872cbb 100644
--- a/pungi/phases/pkgset/sources/source_koji.py
+++ b/pungi/phases/pkgset/sources/source_koji.py
@@ -219,12 +219,15 @@ def populate_global_pkgset(compose, koji_wrapper, path_prefix, event_id):
             koji_wrapper, compose.conf["sigkeys"], logger=compose._logger,
             arches=all_arches)
         variant_tags[variant] = []
-
+        pdc_module_file = os.path.join(compose.paths.work.topdir(arch="global"),
+                                       "pdc-module-%s.json" % variant.uid)
+        pdc_modules = []
         # Find out all modules in every variant and add their compose tags
         # to compose_tags list.
         if session:
             for module in variant.get_modules():
                 pdc_module = get_module(compose, session, module["name"])
+                pdc_modules.append(pdc_module)
                 mmd = modulemd.ModuleMetadata()
                 mmd.loads(pdc_module["modulemd"])
 
@@ -248,7 +251,9 @@ def populate_global_pkgset(compose, koji_wrapper, path_prefix, event_id):
                 variant_tags[variant].append(tag)
                 if tag not in compose_tags:
                     compose_tags.append(tag)
-
+        if pdc_modules:
+            with open(pdc_module_file, 'w') as f:
+                json.dump(pdc_modules, f)
         if not variant_tags[variant]:
             variant_tags[variant].extend(force_list(compose.conf["pkgset_koji_tag"]))
 
diff --git a/tests/helpers.py b/tests/helpers.py
index 38c2e25c..3f258ba9 100644
--- a/tests/helpers.py
+++ b/tests/helpers.py
@@ -46,6 +46,9 @@ class MockVariant(mock.Mock):
         return [v for v in list(self.variants.values())
                 if (not arch or arch in v.arches) and (not types or v.type in types)]
 
+    def get_modules(self, arch=None, types=None):
+        return []
+
 
 class IterableMock(mock.Mock):
     def __iter__(self):
diff --git a/tests/test_pkgset_source_koji.py b/tests/test_pkgset_source_koji.py
index 91f4e78d..8d7b51f4 100644
--- a/tests/test_pkgset_source_koji.py
+++ b/tests/test_pkgset_source_koji.py
@@ -93,6 +93,7 @@ class TestPopulateGlobalPkgset(helpers.PungiTestCase):
         self.compose.DEBUG = False
         self.koji_wrapper = mock.Mock()
         self.pkgset_path = os.path.join(self.topdir, 'work', 'global', 'pkgset_global.pickle')
+        self.pdc_module_path = os.path.join(self.topdir, 'work', 'global', 'pdc-module-Server.json')
 
     @mock.patch('six.moves.cPickle.dumps')
     @mock.patch('pungi.phases.pkgset.pkgsets.KojiPackageSet')
@@ -117,6 +118,27 @@ class TestPopulateGlobalPkgset(helpers.PungiTestCase):
         with open(self.pkgset_path) as f:
             self.assertEqual(f.read(), 'DATA')
 
+    @mock.patch('six.moves.cPickle.dumps')
+    @mock.patch('pungi.phases.pkgset.pkgsets.KojiPackageSet')
+    @mock.patch('pungi.phases.pkgset.sources.source_koji.get_module')
+    @mock.patch('pungi.phases.pkgset.sources.source_koji.get_pdc_client_session')
+    @mock.patch('pungi.phases.pkgset.sources.source_koji.modulemd')
+    def test_pdc_log(self, modulemd, get_pdc_client_session, get_module, KojiPackageSet, pickle_dumps):
+
+        pickle_dumps.return_value = b'DATA'
+
+        get_module.return_value = {'abc': 'def', 'modulemd': 'sth', 'rpms': ['dummy'], 'koji_tag': 'taggg'}
+        for name, variant in self.compose.variants.items():
+            variant.get_modules = mock.MagicMock()
+            if name == 'Server':
+                variant.get_modules.return_value = [{'name': 'a'}]
+
+        source_koji.populate_global_pkgset(
+            self.compose, self.koji_wrapper, '/prefix', 123456)
+        with open(self.pdc_module_path, 'r') as pdc_f:
+            self.assertEqual(json.load(pdc_f),
+                             [{"rpms": ["dummy"], "abc": "def", "koji_tag": "taggg", "modulemd": "sth"}])
+
     @mock.patch('six.moves.cPickle.dumps')
     @mock.patch('pungi.phases.pkgset.pkgsets.KojiPackageSet')
     def test_populate_with_multiple_koji_tags(self, KojiPackageSet, pickle_dumps):