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-rw-r--r--activesupport/lib/active_support/per_thread_registry.rb5
1 files changed, 5 insertions, 0 deletions
diff --git a/activesupport/lib/active_support/per_thread_registry.rb b/activesupport/lib/active_support/per_thread_registry.rb
index 506dd950cb..88e2b12cc7 100644
--- a/activesupport/lib/active_support/per_thread_registry.rb
+++ b/activesupport/lib/active_support/per_thread_registry.rb
@@ -1,4 +1,9 @@
+require 'active_support/core_ext/module/delegation'
+
module ActiveSupport
+ # NOTE: This approach has been deprecated for end-user code in favor of thread_mattr_accessor and friends.
+ # Please use that approach instead.
+ #
# This module is used to encapsulate access to thread local variables.
#
# Instead of polluting the thread locals namespace: