diff --git a/controller_manager/controller_manager/spawner.py b/controller_manager/controller_manager/spawner.py
index ed299d1f40..c47c160a09 100644
--- a/controller_manager/controller_manager/spawner.py
+++ b/controller_manager/controller_manager/spawner.py
@@ -79,7 +79,9 @@ def main(args=None):
     parser.add_argument(
         "-p",
         "--param-file",
-        help="Controller param file to be loaded into controller node before configure",
+        help="Controller param file to be loaded into controller node before configure. "
+        "Parse multiple times to load different files for different controllers or to "
+        "override the parameters of the same controller.",
         default=None,
         action="append",
         required=False,
diff --git a/controller_manager/doc/userdoc.rst b/controller_manager/doc/userdoc.rst
index bd567ff074..d86d8a1b3b 100644
--- a/controller_manager/doc/userdoc.rst
+++ b/controller_manager/doc/userdoc.rst
@@ -168,7 +168,7 @@ There are two scripts to interact with controller manager from launch files:
       -c CONTROLLER_MANAGER, --controller-manager CONTROLLER_MANAGER
                             Name of the controller manager ROS node
       -p PARAM_FILE, --param-file PARAM_FILE
-                            Controller param file to be loaded into controller node before configure
+                            Controller param file to be loaded into controller node before configure. Parse multiple times to load different files for different controllers or to override the parameters of the same controller.
       -n NAMESPACE, --namespace NAMESPACE
                             DEPRECATED Namespace for the controller_manager and the controller(s)
       --load-only           Only load the controller and leave unconfigured.