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diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -37,6 +37,8 @@ For instance:
 
     mammoth document.docx --output-dir=output-dir
 
+Existing files will be overwritten if present.
+
 #### Styles
 
 A custom style map can be read from a file using `--style-map`.