diff --git a/crypto/src/main/java/org/web3j/crypto/WalletUtils.java b/crypto/src/main/java/org/web3j/crypto/WalletUtils.java
index 9de046d6f..387dadb91 100644
--- a/crypto/src/main/java/org/web3j/crypto/WalletUtils.java
+++ b/crypto/src/main/java/org/web3j/crypto/WalletUtils.java
@@ -85,6 +85,8 @@ public static String generateWalletFile(
      * @param password Will be used for both wallet encryption and passphrase for BIP-39 seed
      * @param destinationDirectory The directory containing the wallet
      * @return A BIP-39 compatible Ethereum wallet
+     * @throws CipherException if the underlying cipher is not available
+     * @throws IOException if the destination cannot be written to
      */
     public static Bip39Wallet generateBip39Wallet(String password, File destinationDirectory)
             throws CipherException, IOException {