diff --git a/src/io.py b/src/io.py
index 4194603..5b29a9c 100644
--- a/src/io.py
+++ b/src/io.py
@@ -472,7 +472,7 @@ def main():
         "--fundamental",
         type=float,
         default=100,
-        help="Fundamental frequency in Hz for OSC output (default: 100)",
+        help="Fundamental frequency in Hz for frequencies output and OSC (default: 100)",
     )
     args = parser.parse_args()
 
@@ -639,7 +639,9 @@ def main():
     print(f"Written to {args.output_dir}/output_chords.txt")
 
     write_chord_sequence_frequencies(
-        path_obj.output_chords, os.path.join(args.output_dir, "output_frequencies.txt")
+        path_obj.output_chords,
+        os.path.join(args.output_dir, "output_frequencies.txt"),
+        fundamental=args.fundamental,
     )
     print(f"Written to {args.output_dir}/output_frequencies.txt")