# Special Characters In Tag Parameters

**URL:** <https://forum.inductiveautomation.com/t/special-characters-in-tag-parameters/87199>\
**Category:** Ignition\
**Tags:** vision\
**Created:** [March 12, 2024, 4:14pm UTC](https://forum.inductiveautomation.com/t/special-characters-in-tag-parameters/87199 "2024-03-12T16:14:45Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![William\_R](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/william_r/32/32710_2.png) [@William\_R](https://forum.inductiveautomation.com/u/William_R)\
**Post date:** [March 12, 2024, 4:14pm UTC](https://forum.inductiveautomation.com/t/special-characters-in-tag-parameters/87199/1 "2024-03-12T16:14:45Z")

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Hello All,

I just updated to 8.1.37 and am using Vision. I have a lot of UDTs with underscores in parameter names. Before this used to be ok, but now I am getting a warning that "Parameters names with special characters may not work with bindings". Is an underscore now a special character? Does anyone have information on this change? TIA.

Thanks,  
William

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<div class="post-metadata">

**Author:** ![pturmel](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/pturmel/32/3295_2.png) [@pturmel](https://forum.inductiveautomation.com/u/pturmel)\
**Post date:** [March 12, 2024, 4:20pm UTC](https://forum.inductiveautomation.com/t/special-characters-in-tag-parameters/87199/2 "2024-03-12T16:20:33Z")

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It's just a bug. Underscores are fine.