diff --git a/colorprinter/print_color.py b/colorprinter/print_color.py
index 4e1f4bf..753079f 100644
--- a/colorprinter/print_color.py
+++ b/colorprinter/print_color.py
@@ -81,7 +81,7 @@ def print_rainbow(*args, single_line=False):
                - If the argument is a list, each element in the list will be printed in a different color.
                - If the argument is a dictionary, each key-value pair will be printed in a different color.
                - If the argument is a string or any other type, it will be printed in a different color.
-
+        single_line (bool): If True, prints each item on a new line. Default is False.
     Returns:
         None
     """