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diff --git a/README.md b/README.md
index 7288f4dd3..232cc2205 100644
--- a/README.md
+++ b/README.md
@@ -84,6 +84,7 @@ which means you can modify it, redistribute it or use it however you like.
                                file modification time
     --write-description        write video description to a .description file
     --write-info-json          write video metadata to a .info.json file
+    --write-thumbnail          write thumbnail image to disk
 
 ## Verbosity / Simulation Options:
     -q, --quiet                activates quiet mode