# Signal Field Schema Documentation

**URL:** <https://discuss.elastic.co/t/signal-field-schema-documentation/274912>\
**Category:** SIEM\
**Tags:** detection-rules\
**Created:** [June 3, 2021, 7:06pm UTC](https://discuss.elastic.co/t/signal-field-schema-documentation/274912 "2021-06-03T19:06:27Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Amorik](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/amorik/32/89801_2.png) [@Amorik](https://discuss.elastic.co/u/Amorik)\
**Post date:** [June 3, 2021, 7:06pm UTC](https://discuss.elastic.co/t/signal-field-schema-documentation/274912/1 "2021-06-03T19:06:27Z")

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Detection's creates the `.siem-signals` index responsible for housing alerts generated by the system. While it conforms to ECS the fields under `signal.*` are not documented [GitHub - elastic/ecs: Elastic Common Schema](https://github.com/elastic/ecs). Is there any documentation regarding the field structure and if so where?

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<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [July 1, 2021, 7:07pm UTC](https://discuss.elastic.co/t/signal-field-schema-documentation/274912/2 "2021-07-01T19:07:01Z")

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