diff --git a/bin/deepstate/reducer.py b/bin/deepstate/reducer.py
index d9e8e96..bb167e5 100644
--- a/bin/deepstate/reducer.py
+++ b/bin/deepstate/reducer.py
@@ -30,7 +30,7 @@ def main():
         "output_test", type=str, help="Path for reduced test.")
 
     parser.add_argument(
-        "--which_test", type=str, help="Which test run run.", default=None)
+        "--which_test", type=str, help="Which test to run (equivalent to --input_which_test).", default=None)
 
     parser.add_argument(
         "--criteria", type=str, help="String to search for in valid reduction outputs.",