diff --git a/main.py b/main.py
index fa6d71d..57e3a44 100755
--- a/main.py
+++ b/main.py
@@ -39,6 +39,9 @@ def enforce_list(key: str, dict_: dict):
         abort(f"{key} is not a list. Offending dict: {dict_}")
 
 
+def add_part_of(args, unit_file: IniFile):
+    unit_file["Unit"]["PartOf"] = args.target
+
 def write_file(ini_file: IniFile, path: Path):
     with open(path, "w", encoding="utf-8") as f:
         ini_file.write(f)
@@ -79,6 +82,7 @@ def write_network_units(args, yaml_dict):
         unit_file = IniFile()
         unit_file["Unit"] = {}
         unit_file["Unit"]["Description"] = f"{network_name.capitalize()} network"
+        add_part_of(args, unit_file)
 
         unit_file["Network"] = {}
         if "name" in network:
@@ -105,6 +109,7 @@ def write_service_units(args, yaml_dict):
         unit_file = IniFile()
         unit_file["Unit"] = {}
         unit_file["Unit"]["Description"] = f"{service_name.capitalize()} container"
+        add_part_of(args, unit_file)
         # currently decreases reliability instead of increasing it
         # if "depends_on" in service:
         #     enforce_list("depends_on", service)
@@ -180,6 +185,8 @@ def parse_args():
     parser.add_argument("compose_file")
     parser.add_argument("-o", "--output-dir", help="output directory for unit files",
                         default="/etc/containers/systemd", type=Path)
+    parser.add_argument("-t", "--target",
+                        help="Add PartOf dependency to all unit files", default="containers.target")
     return parser.parse_args()