[ci skip] Improve remove_column documentation

Since when we remove one column it will also remove the associated
indexes, we must ensure this behaviour is properly documented.

In this commit we add a line to the documentation mentioning this
behaviour.

1 files changed, 1 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 199674f531..9d9a8626de 100644
--- a/activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb
+++ b/activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb
@@ -599,6 +599,7 @@ module ActiveRecord
       # The +type+ and +options+ parameters will be ignored if present. It can be helpful
       # to provide these in a migration's +change+ method so it can be reverted.
       # In that case, +type+ and +options+ will be used by #add_column.
+      # Indexes on the column are automatically removed.
       def remove_column(table_name, column_name, type = nil, options = {})
         execute "ALTER TABLE #{quote_table_name(table_name)} #{remove_column_for_alter(table_name, column_name, type, options)}"
       end