# Parameter tunability?

**URL:** <https://discourse.julialang.org/t/parameter-tunability/87756>\
**Category:** Modelling & Simulations\
**Created:** [September 24, 2022, 6:38pm UTC](https://discourse.julialang.org/t/parameter-tunability/87756 "2022-09-24T18:38:56Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![lamorton](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/lamorton/32/21115_2.png) [@lamorton](https://discourse.julialang.org/u/lamorton)\
**Post date:** [September 24, 2022, 6:38pm UTC](https://discourse.julialang.org/t/parameter-tunability/87756/1 "2022-09-24T18:38:56Z")

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I noticed [in the docs on ModelingToolkit master branch](https://github.com/SciML/ModelingToolkit.jl/blob/master/docs/src/basics/Variable_metadata.md#mark-parameter-as-tunable) that there’s a mention of having a metadata tag that controls whether a parameter is considered adjustable by an optimizer.

Is this supported already, or still in the works?

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**Author:** ![ChrisRackauckas](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/chrisrackauckas/32/77_2.png) [@ChrisRackauckas](https://discourse.julialang.org/u/ChrisRackauckas)\
**Post date:** [September 24, 2022, 7:20pm UTC](https://discourse.julialang.org/t/parameter-tunability/87756/2 "2022-09-24T19:20:37Z")

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> [@lamorton](#):
>
> Is this supported already, or still in the works?

The metadata is there, it just needs to be supported downstream.