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diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -91,7 +91,12 @@ with open("document.docx", "rb") as docx_file:
 ```
 
 User-defined style mappings are used in preference to the default style mappings.
+To stop using the default style mappings altogether,
+set pass `includeDefaultStyleMap=False`:
 
+```python
+    result = mammoth.convert_to_html(docx_file, style_map=style_map, include_default_style_map=False)
+```
 ## Writing style maps
 
 A style map is made up of a number of style mappings separated by new lines.