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diff --git a/README.md b/README.md
index a621be7..60cf0d4 100644
--- a/README.md
+++ b/README.md
@@ -120,6 +120,7 @@ v1.1, 2016-10-19
  * AES-SIV (RFC5297) encryption to implement deterministic encryption
    securely. Uses the excellent
    [jacobsa/crypto](https://github.com/jacobsa/crypto) library.
+   The corresponding feature flag is called `AESSIV`.
  * New command-line options: `-reverse`, `-aessiv`
  * Filesystems using reverse mode can only be mounted with gocryptfs v1.1
    and later.