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-rw-r--r--activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb2
1 files changed, 2 insertions, 0 deletions
diff --git a/activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb b/activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb
index f36c1f111a..f57c7a5d4d 100644
--- a/activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb
+++ b/activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb
@@ -406,6 +406,8 @@ module ActiveRecord
#
# Defaults to false.
#
+ # Only supported on the MySQL adapter, ignored elsewhere.
+ #
# ====== Add a column
#
# change_table(:suppliers) do |t|