diff --git a/stages/org.osbuild.bootc.install-to-filesystem b/stages/org.osbuild.bootc.install-to-filesystem
index 6b8c376a..19ca4d69 100755
--- a/stages/org.osbuild.bootc.install-to-filesystem
+++ b/stages/org.osbuild.bootc.install-to-filesystem
@@ -2,7 +2,9 @@
 """Run bootc install to-filesystem
 
 Note that this needs the disk.img in the inputs as one continous
-devices so that bootupd can install grub to the mbr.
+devices so that bootupd can install grub to the mbr. It also needs
+all relevant mount points for booting (e.g. /boot, /boot/efi) in
+mounted in the "mounts" path.
 
 Buildhost commands used: bootc
 """
@@ -40,23 +42,23 @@ SCHEMA_2 = r"""
 """
 
 
-def main(inputs, mounts):
+def main(inputs, paths):
     images = containers.parse_containers_input(inputs)
     assert len(images) == 1
     image = list(images.values())[0]
 
     with containers.container_source(image) as (_, source):
-        dst = mounts["root"]["path"]
+        dst = paths["mounts"]
         subprocess.run(
             ["bootc", "install", "to-filesystem",
              "--source-imgref", source,
              "--skip-fetch-check", "--generic-image",
              dst],
-            check=True
+            check=True,
         )
 
 
 if __name__ == "__main__":
     args = osbuild.api.arguments()
-    r = main(args["inputs"], args["mounts"])
+    r = main(args["inputs"], args["paths"])
     sys.exit(r)
diff --git a/stages/test/test_bootc_install_to_fs.py b/stages/test/test_bootc_install_to_fs.py
index a87d7139..4d424aa8 100644
--- a/stages/test/test_bootc_install_to_fs.py
+++ b/stages/test/test_bootc_install_to_fs.py
@@ -25,22 +25,20 @@ def test_bootc_install_to_fs(mock_run, tmp_path):
             },
         },
     }
-    mounts = {
-        "root": {
-            "path": "/path/to/root",
-        },
+    paths = {
+        "mounts": "/path/to/mounts",
     }
 
     @contextmanager
     def faked_tmp_dir():
         yield tmp_path
     with patch("tempfile.TemporaryDirectory", side_effect=faked_tmp_dir):
-        stage.main(inputs, mounts)
+        stage.main(inputs, paths)
 
     assert len(mock_run.call_args_list) == 1
     assert mock_run.call_args_list == [
         call(["bootc", "install", "to-filesystem",
               "--source-imgref", f"oci-archive:{tmp_path}/image",
               "--skip-fetch-check", "--generic-image",
-              "/path/to/root"], check=True)
+              "/path/to/mounts"], check=True)
     ]