diff --git a/README.md b/README.md
index d5e5758..5bc424a 100644
--- a/README.md
+++ b/README.md
@@ -86,7 +86,7 @@ Mastery levels
 [ --extra-orb=EXTRA_ORB_MASTERY_LEVEL ]
 [ --intro-sprint=INTRO_SPRINT_MASTERY_LEVEL ]
 [ --recovery-package=RECOVERY_PACKAGE_MASTERY_LEVEL ]
-[ --wake-skip=WAVE_SKIP_MASTERY_LEVEL ]
+[ --wave-skip=WAVE_SKIP_MASTERY_LEVEL ]
 [ --wave-accelerator=WAVE_ACCELERATOR_MASTERY_LEVEL ]
 ```
 Each mastery level accepts the values `locked`, or `0` through `9`. By default,
diff --git a/mastery_calc.py b/mastery_calc.py
index 49d6c9e..a517f05 100755
--- a/mastery_calc.py
+++ b/mastery_calc.py
@@ -562,7 +562,7 @@ def add_common_args(parser: argparse.ArgumentParser):
     parser.add_argument(
         "--freeup-chance",
         nargs=3,
-        type=int,
+        type=float,
         default=[75, 75, 75],
         help="Free-upgrade chances (attack %%, defense %%, utility %%)",
     )
@@ -2061,4 +2061,4 @@ def main():
     try:
         main()
     except BrokenPipeError:
-        pass
\ No newline at end of file
+        pass