# How to use include\_summand

**URL:** <https://discourse.mc-stan.org/t/how-to-use-include-summand/18140>\
**Category:** Developers\
**Tags:** example-models\
**Created:** [September 22, 2020, 9:00pm UTC](https://discourse.mc-stan.org/t/how-to-use-include-summand/18140 "2020-09-22T21:00:18Z")\
**Posts on this page:** 1\
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**Author:** ![bbbales2](https://yyz2.discourse-cdn.com/flex030/user_avatar/discourse.mc-stan.org/bbbales2/32/77_2.png) [@bbbales2](https://discourse.mc-stan.org/u/bbbales2)\
**Post date:** [September 22, 2020, 9:12pm UTC](https://discourse.mc-stan.org/t/how-to-use-include-summand/18140/3 "2020-09-22T21:12:09Z")

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Oh yeah currently `propto = TRUE` is only set to true for things using the sampling syntax. There’s a discussion over here of extending the rules so users can take advantage of the proportionality thing manually: [Request for final feedback: User controlled unnormalized (propto) distribution syntax](https://discourse.mc-stan.org/t/request-for-final-feedback-user-controlled-unnormalized-propto-distribution-syntax/16029)

I think this still may be an outstanding issue with `propto` handling: [https://github.com/stan-dev/stanc3/issues/541#issuecomment-632003010](https://github.com/stan-dev/stanc3/issues/541#issuecomment-632003010)

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