diff --git a/tools/destination-tester/README.md b/tools/destination-tester/README.md
index dc0c33f..3e290f0 100644
--- a/tools/destination-tester/README.md
+++ b/tools/destination-tester/README.md
@@ -168,3 +168,6 @@ This option disables encryption and compression of batch files for debugging pur
 
 #### --input-file
 The tester by default reads all input files from local data folder and executes them in the alphabetical order they appear. You can specify a single input file to be read and executed using this option. Providing just the filename is sufficient.
+
+#### --batch-file-type
+We support generating batch files in both CSV and Parquet formats. By default, tester uses CSV, but you can also specify PARQUET using this CLI argument.