diff --git a/core/src/main/java/org/bitcoinj/crypto/KeyCrypterScrypt.java b/core/src/main/java/org/bitcoinj/crypto/KeyCrypterScrypt.java
index 2b201f00..1443e3a5 100644
--- a/core/src/main/java/org/bitcoinj/crypto/KeyCrypterScrypt.java
+++ b/core/src/main/java/org/bitcoinj/crypto/KeyCrypterScrypt.java
@@ -103,8 +103,8 @@ public class KeyCrypterScrypt implements KeyCrypter {
     }
 
     /**
-     * Encryption/Decryption using custom number of iterations parameters and a random salt. A useful value for mobile
-     * devices is 512 (~500 ms).
+     * Encryption/Decryption using custom number of iterations parameters and a random salt.
+     * As of August 2016, a useful value for mobile devices is 4096 (derivation takes about 1 second).
      *
      * @param iterations
      *            number of scrypt iterations