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-rw-r--r--guides/source/configuring.md4
1 files changed, 4 insertions, 0 deletions
diff --git a/guides/source/configuring.md b/guides/source/configuring.md
index e2206667e8..e2125cae2e 100644
--- a/guides/source/configuring.md
+++ b/guides/source/configuring.md
@@ -313,6 +313,10 @@ All these configuration options are delegated to the `I18n` library.
by a query exceeds the threshold, a warning is logged. This can be used to
identify queries which might be causing memory bloat.
+* `config.active_record.index_nested_attribute_errors` allows errors for nested
+ has_many relationships to be displayed with an index as well as the error.
+ Defaults to false.
+
The MySQL adapter adds one additional configuration option:
* `ActiveRecord::ConnectionAdapters::MysqlAdapter.emulate_booleans` controls whether Active Record will consider all `tinyint(1)` columns in a MySQL database to be booleans and is true by default.