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-rw-r--r--activesupport/lib/active_support/message_encryptor.rb4
1 files changed, 2 insertions, 2 deletions
diff --git a/activesupport/lib/active_support/message_encryptor.rb b/activesupport/lib/active_support/message_encryptor.rb
index c82a13511e..2dde01c844 100644
--- a/activesupport/lib/active_support/message_encryptor.rb
+++ b/activesupport/lib/active_support/message_encryptor.rb
@@ -34,8 +34,8 @@ module ActiveSupport
# Initialize a new MessageEncryptor. +secret+ must be at least as long as
# the cipher key size. For the default 'aes-256-cbc' cipher, this is 256
# bits. If you are using a user-entered secret, you can generate a suitable
- # key with <tt>OpenSSL::Digest::SHA256.new(user_secret).digest</tt> or
- # similar.
+ # key by using <tt>ActiveSupport::KeyGenerator</tt> or a similar key
+ # derivation function.
#
# Options:
# * <tt>:cipher</tt> - Cipher to use. Can be any cipher returned by