Type error in ActiveSupport::Cache::Store documentation. Section fetch.

On page http://api.rubyonrails.org/classes/ActiveSupport/Cache/Store.html type error in options for method fetch(name, options = nil):

Setting :expires_in ... :

 cache = ActiveSupport::Cache::MemoryStore.new(:expire_in => 5.minutes)
 cache.write(key, value, :expire_in => 1.minute)  # Set a lower value for one entry

In example settings must be "expires_in" not "expire_in".
Some code from mem_cache_store.rb:

 # Write an entry to the cache.
 def write_entry(key, entry, options) # :nodoc:
   method = options && options[:unless_exist] ? :add : :set
   value = options[:raw] ? entry.value.to_s : entry
   expires_in = options[:expires_in].to_i
   ...

Code use option "expires_in".