diff --git a/empack/pack.py b/empack/pack.py
index a4292e8..e4440b9 100644
--- a/empack/pack.py
+++ b/empack/pack.py
@@ -225,17 +225,21 @@ def add_tarfile_to_env_meta(env_meta_filename, tarfile):
         )
 
     tarfile_name = Path(tarfile).name
-    package_item = {"name": tarfile_name, "filename": tarfile_name}
-    # check that the package is not already in the list
-    for pkg in env_meta["packages"]:
-        if pkg["filename"] == tarfile_name:
-            msg = f"package with filename '{tarfile_name}' already in env meta file"
+    mount_point_item = {"name": tarfile_name, "filename": tarfile_name}
+
+    if "mounts" not in env_meta:
+        env_meta["mounts"] = []
+
+    # check that the mount point is not already in the list
+    for mount_point in env_meta["mounts"]:
+        if mount_point["filename"] == tarfile_name:
+            msg = f"mount point with filename '{tarfile_name}' already in env meta file"
             raise RuntimeError(msg)
-        if pkg["name"] == package_item["name"]:
-            msg = f"package with name '{package_item['name']}' already in env meta file"
+        if mount_point["name"] == mount_point_item["name"]:
+            msg = f"mount point with name '{mount_point_item['name']}' already in env meta file"
             raise RuntimeError(msg)
 
-    env_meta["packages"].append(package_item)
+    env_meta["mounts"].append(mount_point_item)
     with open(env_meta_filename, "w") as f:
         json.dump(env_meta, f, indent=4)
 
diff --git a/tests/test_cli.py b/tests/test_cli.py
index cc266ff..67453de 100644
--- a/tests/test_cli.py
+++ b/tests/test_cli.py
@@ -82,15 +82,19 @@ def test_pack_env(self, tmp_path, use_cache):
         print(result.stdout)
         assert result.exit_code == 0
 
-        # check that there is a json with all the packages
+        # check that there is a json in the output
         env_metadata_json_path = tmp_path / "empack_env_meta.json"
         assert env_metadata_json_path.exists()
 
+        # check the mount point is defined in the lock file
         with open(env_metadata_json_path) as f:
             env_meta = json.load(f)
+        mount_points = env_meta["mounts"]
         packages = env_meta["packages"]
         env_meta_dict = dict()
 
+        for pkg in mount_points:
+            env_meta_dict[pkg["name"]] = pkg
         for pkg in packages:
             env_meta_dict[pkg["name"]] = pkg
 
diff --git a/tests/test_pack.py b/tests/test_pack.py
index 0df594f..f3f6cd0 100644
--- a/tests/test_pack.py
+++ b/tests/test_pack.py
@@ -86,16 +86,17 @@ def test_append(tmp_path):
     # append the directory to the env
     add_tarfile_to_env_meta(env_meta_filename=tmp_path, tarfile=tmp_path / "packaged_dir.tar.gz")
 
-    # check that there is a json with all the packages
+    # check that there is a json in the output
     env_metadata_json_path = tmp_path / "empack_env_meta.json"
     assert env_metadata_json_path.exists()
 
+    # check the mount point is defined in the lock file
     with open(env_metadata_json_path) as f:
         env_meta = json.load(f)
-    packages = env_meta["packages"]
+    mount_points = env_meta["mounts"]
     env_meta_dict = dict()
 
-    for pkg in packages:
+    for pkg in mount_points:
         env_meta_dict[pkg["filename"]] = pkg
 
     assert "packaged_dir.tar.gz" in env_meta_dict