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-rw-r--r--activerecord/lib/active_record/attribute_methods/serialization.rb3
1 files changed, 3 insertions, 0 deletions
diff --git a/activerecord/lib/active_record/attribute_methods/serialization.rb b/activerecord/lib/active_record/attribute_methods/serialization.rb
index 1287de0d0d..6b77cc9e83 100644
--- a/activerecord/lib/active_record/attribute_methods/serialization.rb
+++ b/activerecord/lib/active_record/attribute_methods/serialization.rb
@@ -24,6 +24,9 @@ module ActiveRecord
# serialized object must be of that class on retrieval or
# <tt>SerializationTypeMismatch</tt> will be raised.
#
+ # A notable side effect of serialized attributes is that the model will
+ # be updated on every save, even if it is not dirty.
+ #
# ==== Parameters
#
# * +attr_name+ - The field name that should be serialized.