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-rw-r--r--activerecord/lib/active_record/nested_attributes.rb3
1 files changed, 3 insertions, 0 deletions
diff --git a/activerecord/lib/active_record/nested_attributes.rb b/activerecord/lib/active_record/nested_attributes.rb
index 8a2a06f2ca..0f9b52f69f 100644
--- a/activerecord/lib/active_record/nested_attributes.rb
+++ b/activerecord/lib/active_record/nested_attributes.rb
@@ -81,6 +81,9 @@ module ActiveRecord
#
# Note that the model will _not_ be destroyed until the parent is saved.
#
+ # Also note that the model will not be destroyed unless you also specify
+ # its id in the updated hash.
+ #
# === One-to-many
#
# Consider a member that has a number of posts: