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diff --git a/README.md b/README.md
index c382cac..e59a3af 100644
--- a/README.md
+++ b/README.md
@@ -28,6 +28,16 @@ For instance:
 
 If no output file is specified, output is written to stdout instead.
 
+Custom styles can be read from a file using `--styles`.
+For instance:
+
+    mammoth document.docx output.html --styles=custom-styles
+    
+Where custom-styles looks something like:
+
+    p.AsideHeading => div.aside > h2:fresh
+    p.AsideText => div.aside > p:fresh
+
 ### API
 
 To convert an existing .docx file to HTML,