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-rw-r--r--activesupport/lib/active_support/hash_with_indifferent_access.rb6
1 files changed, 6 insertions, 0 deletions
diff --git a/activesupport/lib/active_support/hash_with_indifferent_access.rb b/activesupport/lib/active_support/hash_with_indifferent_access.rb
index 74a603c05d..7ecc5c19bd 100644
--- a/activesupport/lib/active_support/hash_with_indifferent_access.rb
+++ b/activesupport/lib/active_support/hash_with_indifferent_access.rb
@@ -40,6 +40,12 @@ module ActiveSupport
# rgb = { black: '#000000', white: '#FFFFFF' }.with_indifferent_access
#
# which may be handy.
+ #
+ # To access this class outside of Rails, require the core extension with:
+ #
+ # require "active_support/core_ext/hash/indifferent_access"
+ #
+ # which will, in turn, require this file.
class HashWithIndifferentAccess < Hash
# Returns +true+ so that <tt>Array#extract_options!</tt> finds members of
# this class.