diff --git a/README.md b/README.md
index a0504c5..f295d58 100644
--- a/README.md
+++ b/README.md
@@ -15,7 +15,7 @@ $ pip install marctable
 To convert all the MARC fields to CSV columns:
 
 ```
-$ marctable data.marc data.csv
+$ marctable csv data.marc data.csv
 ```
 
 For example, this will generate a CSV with 215 columns, one column for each MARC field. Fields that can repeat will appear as a list: