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diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -40,6 +40,7 @@ Tool for generating Elliptic curve domain parameters.
  - `-m / --memory=SIZE`		Use PARI stack of `SIZE` (can have suffix k/m/g).
  - `--threads=NUM`			Use `NUM` threads.
  - `--thread-stack=SIZE`	Use PARI stack of `SIZE` (per thread, can have suffix k/m/g).
+ - `--timeout=TIME`			Timeout computation of a curve parameter after `TIME` (can have suffix s/m/h/d).
 
 #### Examples