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-rw-r--r--activesupport/lib/active_support/message_encryptor.rb5
1 files changed, 5 insertions, 0 deletions
diff --git a/activesupport/lib/active_support/message_encryptor.rb b/activesupport/lib/active_support/message_encryptor.rb
index 0671469788..aaa12efca6 100644
--- a/activesupport/lib/active_support/message_encryptor.rb
+++ b/activesupport/lib/active_support/message_encryptor.rb
@@ -50,6 +50,11 @@ module ActiveSupport
# key by using <tt>ActiveSupport::KeyGenerator</tt> or a similar key
# derivation function.
#
+ # First additional parameter is used as the signature key for +MessageVerifier+.
+ # This allows you to specify keys to encrypt and sign data.
+ #
+ # ActiveSupport::MessageEncryptor.new('secret', 'signature_key')
+ #
# Options:
# * <tt>:cipher</tt> - Cipher to use. Can be any cipher returned by
# <tt>OpenSSL::Cipher.ciphers</tt>. Default is 'aes-256-cbc'.