make note of --describe option to dump in readme

Homebrew · Oct 2, 2018 · 1fe4981 · 1fe4981
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commit 1fe4981
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diff --git a/Readme.md b/Readme.md
@@ -60,6 +60,7 @@ $ brew bundle dump
 ```
 
 The `--force` option will allow an existing `Brewfile` to be overwritten as well.
+The `--describe` option will output a description comment above each line.
 
 ### Cleanup