# Source System Table & Field Documentation
**URL:** https://discourse.getdbt.com/t/source-system-table-field-documentation/10363
**Category:** Help
**Tags:** documentation
**Created:** [October 16, 2023, 9:21pm UTC](https://discourse.getdbt.com/t/source-system-table-field-documentation/10363 "2023-10-16T21:21:58Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@JamesLarsen42](https://discourse.getdbt.com/u/JamesLarsen42)
#### Post date: [October 16, 2023, 9:21pm UTC](https://discourse.getdbt.com/t/source-system-table-field-documentation/10363/1 "2023-10-16T21:21:58Z")
I’m new to dbt, and am about to build a number of target models for my new company. One of the key pieces will be utilizing the documentation functionality. However, I want a place to document our source tables / fields. In particular, I only want to document each source field once, even if it is used by multiple target models. Is this a built in feature with dbt? If someone can point me in the right direction to do more research, I’d greatly appreciate it!
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### Author:  [@a\_slack\_user](https://discourse.getdbt.com/u/a_slack_user)
#### Post date: [October 16, 2023, 10:04pm UTC](https://discourse.getdbt.com/t/source-system-table-field-documentation/10363/2 "2023-10-16T22:04:29Z")
Look into using doc blocks for reusable docs.
Note: `@Jack Nguyen` originally [posted this reply in Slack](https://getdbt.slack.com/archives/CBSQTAPLG/p1697493862554599?thread_ts=1697491340.939189&cid=CBSQTAPLG). It might not have transferred perfectly.
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### Author:  [@a\_slack\_user](https://discourse.getdbt.com/u/a_slack_user)
#### Post date: [October 16, 2023, 10:29pm UTC](https://discourse.getdbt.com/t/source-system-table-field-documentation/10363/3 "2023-10-16T22:29:13Z")
Ditto on leveraging doc blocks. h/t \<@U05TBUYDPDW\>
You can also play with this upstream\_description parameter from codegen:
````auto
model_name='YOUR_MODEL_NAME',
upstream_descriptions='TRUE'
) }}```
Note: `@rho` originally [posted this reply in Slack](https://getdbt.slack.com/archives/CBSQTAPLG/p1697495345869249?thread_ts=1697491340.939189&cid=CBSQTAPLG). It might not have transferred perfectly.
````
---
### Author:  [@rho](https://discourse.getdbt.com/u/rho)
#### Post date: [October 16, 2023, 10:32pm UTC](https://discourse.getdbt.com/t/source-system-table-field-documentation/10363/4 "2023-10-16T22:32:48Z")
That didn’t seem to paste well. You can also play with this upstream\_description parameter from codegen:
```auto
{{ codegen.generate_model_yaml(
model_name='YOUR_MODEL_NAME',
upstream_descriptions='TRUE'
) }}
```