diff --git a/pungi/phases/buildinstall.py b/pungi/phases/buildinstall.py
index e2f4ff07..6485a82b 100644
--- a/pungi/phases/buildinstall.py
+++ b/pungi/phases/buildinstall.py
@@ -255,7 +255,7 @@ BOOT_CONFIGS = [
 ]
 
 
-def tweak_configs(path, volid, ks_file, configs=BOOT_CONFIGS):
+def tweak_configs(path, volid, ks_file, configs=BOOT_CONFIGS, logger=None):
     volid_escaped = volid.replace(" ", r"\x20").replace("\\", "\\\\")
     volid_escaped_2 = volid_escaped.replace("\\", "\\\\")
     found_configs = []
@@ -266,7 +266,7 @@ def tweak_configs(path, volid, ks_file, configs=BOOT_CONFIGS):
         found_configs.append(config)
 
         with open(config_path, "r") as f:
-            data = f.read()
+            data = original_data = f.read()
         os.unlink(config_path)  # break hadlink by removing file writing a new one
 
         # double-escape volid in yaboot.conf
@@ -283,6 +283,9 @@ def tweak_configs(path, volid, ks_file, configs=BOOT_CONFIGS):
         with open(config_path, "w") as f:
             f.write(data)
 
+        if logger and data != original_data:
+            logger.info('Boot config %s changed' % config_path)
+
     return found_configs
 
 
@@ -311,7 +314,7 @@ def tweak_buildinstall(compose, src, dst, arch, variant, label, volid, kickstart
     )
     run(cmd)
 
-    found_configs = tweak_configs(tmp_dir, volid, kickstart_file)
+    found_configs = tweak_configs(tmp_dir, volid, kickstart_file, logger=compose._logger)
     if kickstart_file and found_configs:
         shutil.copy2(kickstart_file, os.path.join(dst, "ks.cfg"))
 
diff --git a/pungi_utils/patch_iso.py b/pungi_utils/patch_iso.py
index 789bf8d9..3e55affd 100644
--- a/pungi_utils/patch_iso.py
+++ b/pungi_utils/patch_iso.py
@@ -96,7 +96,7 @@ def run(log, opts):
         # if ks.cfg is detected, patch syslinux + grub to use it
         if 'ks.cfg' in graft_points:
             log.info('Adding ks.cfg to boot configs')
-            tweak_configs(work_dir, volume_id, graft_points['ks.cfg'])
+            tweak_configs(work_dir, volume_id, graft_points['ks.cfg'], logger=log)
 
         arch = opts.force_arch or get_arch(log, work_dir)
 
diff --git a/tests/test_buildinstall.py b/tests/test_buildinstall.py
index 28634bf5..cf73c760 100644
--- a/tests/test_buildinstall.py
+++ b/tests/test_buildinstall.py
@@ -1028,12 +1028,17 @@ class TestSymlinkIso(PungiTestCase):
 class TestTweakConfigs(PungiTestCase):
 
     def test_tweak_configs(self):
+        logger = mock.Mock()
         configs = []
         for cfg in BOOT_CONFIGS:
             if 'yaboot' not in cfg:
                 configs.append(os.path.join(self.topdir, cfg))
                 touch(configs[-1], ':LABEL=baz')
-        tweak_configs(self.topdir, 'new volid', os.path.join(self.topdir, 'ks.cfg'))
+        found_configs = tweak_configs(self.topdir, 'new volid', os.path.join(self.topdir, 'ks.cfg'), logger=logger)
+        self.assertEqual(
+            logger.info.call_args_list,
+            [mock.call('Boot config %s changed' % os.path.join(self.topdir, cfg)) for cfg in found_configs]
+        )
         for cfg in configs:
             self.assertFileContent(
                 cfg, ":LABEL=new\\x20volid ks=hd:LABEL=new\\x20volid:/ks.cfg\n"
diff --git a/tests/test_patch_iso.py b/tests/test_patch_iso.py
index dcd2a31b..480b94f3 100644
--- a/tests/test_patch_iso.py
+++ b/tests/test_patch_iso.py
@@ -224,7 +224,7 @@ class TestPatchingIso(unittest.TestCase):
                                     input_charset='utf-8',
                                     volid='foobar')])
         self.assertEqual(tweak_configs.call_args_list,
-                         [mock.call(ANYTHING, 'foobar', 'path/to/ks.cfg')])
+                         [mock.call(ANYTHING, 'foobar', 'path/to/ks.cfg', logger=log)])
         self.assertEqual(copy_all.mock_calls,
                          [mock.call('mounted-iso-dir', ANYTHING)])
         self.assertEqual(