diff --git a/README.md b/README.md
index 779405e..ace41b5 100644
--- a/README.md
+++ b/README.md
@@ -14,6 +14,7 @@ It expects that the json input is formatted as an object containing an array of
 | freezeTopRow | true | Freezes the first row of the Excel worksheet |
 | autofilter | true | Sets the auto filter on the first row |
 | autowidth | true | Automatically set the column width to fit contents |
+| overwriteFile | false | Overwrite any existing output file instead of modifying in-place |
 
 ## Advanced configuration