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diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -13,6 +13,8 @@ streams:
    mentioned in it.
  - `fi-prune-empty`: Prunes a fast-import stream, removing empty
    commits and empty merges.
+ - `fi-sponge`: Soaks up a fast-import stream, and re-emits it,
+   potentially with different flags.
 
 There are also a few special-purpose commands for working with
 fast-import streams of the Arch Build System: