diff --git a/swash/processing/post.py b/swash/processing/post.py
index beac68b..080c98a 100644
--- a/swash/processing/post.py
+++ b/swash/processing/post.py
@@ -11,7 +11,7 @@ import scipy.signal as sgl
 from .read_swash import *
 
 
-parser = argparse.ArgumentParser(description="Pre-process bathymetry")
+parser = argparse.ArgumentParser(description="Post-process swash output")
 parser.add_argument("-v", "--verbose", action="count", default=0)
 args = parser.parse_args()