diff --git a/README.md b/README.md
index 4c5370e..5b08a2d 100644
--- a/README.md
+++ b/README.md
@@ -109,7 +109,7 @@ options:
                         Directory to generate output files in. By default,
                         package files are stored next to their corresponding
                         package.xml, top-level files like overlay.nix in the
-                        current directory) (default: None)
+                        current directory. (default: None)
   --fetch               Use fetches like fetchFromGitHub in src attribute
                         values. The fetch function and its parameters are
                         determined from the local git work tree. sourceRoot
@@ -150,7 +150,9 @@ options:
                         2 if a change is detected. Useful for CI. (default:
                         False)
   --copyright-holder COPYRIGHT_HOLDER
-  --license LICENSE     License of the generated Nix expression, e.g. 'BSD'
+                        Copyright holder of the generated Nix expressions.
+                        (default: None)
+  --license LICENSE     License of the generated Nix expressions, e.g. 'BSD'
                         (default: None)
 ```
 
diff --git a/ros2nix/ros2nix.py b/ros2nix/ros2nix.py
index 34e3673..2b44c3c 100755
--- a/ros2nix/ros2nix.py
+++ b/ros2nix/ros2nix.py
@@ -200,7 +200,7 @@ def ros2nix(args):
         "--output-dir",
         help="Directory to generate output files in. "
         "By default, package files are stored next to their corresponding package.xml, "
-        "top-level files like overlay.nix in the current directory)",
+        "top-level files like overlay.nix in the current directory.",
     )
 
     parser.add_argument(
@@ -267,9 +267,11 @@ def ros2nix(args):
         "Exit with exit code 2 if a change is detected. Useful for CI.",
     )
 
-    parser.add_argument("--copyright-holder")
     parser.add_argument(
-        "--license", help="License of the generated Nix expression, e.g. 'BSD'"
+        "--copyright-holder", help="Copyright holder of the generated Nix expressions."
+    )
+    parser.add_argument(
+        "--license", help="License of the generated Nix expressions, e.g. 'BSD'"
     )
 
     args = parser.parse_args()