# Can I Have Capital letters and special characters in my package id for publishing in play store
**URL:** https://community.thunkable.com/t/can-i-have-capital-letters-and-special-characters-in-my-package-id-for-publishing-in-play-store/1098495
**Category:** Questions about Thunkable X
**Created:** [February 15, 2021, 3:12pm UTC](https://community.thunkable.com/t/can-i-have-capital-letters-and-special-characters-in-my-package-id-for-publishing-in-play-store/1098495 "2021-02-15T15:12:03Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@gm\_shack](https://community.thunkable.com/u/gm_shack)
#### Post date: [February 15, 2021, 3:12pm UTC](https://community.thunkable.com/t/can-i-have-capital-letters-and-special-characters-in-my-package-id-for-publishing-in-play-store/1098495/1 "2021-02-15T15:12:03Z")
Can I Have Capital letters and special characters in my package id for publishing in play store
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### Author:  [@jane](https://community.thunkable.com/u/jane)
#### Post date: [February 15, 2021, 4:13pm UTC](https://community.thunkable.com/t/can-i-have-capital-letters-and-special-characters-in-my-package-id-for-publishing-in-play-store/1098495/2 "2021-02-15T16:13:20Z")
Hi there,
You can see the guidelines for a package name [here](https://developer.android.com/studio/build/application-id).
- It must have at least two segments (one or more dots)
- Each segment must start with a letter
- All characters must be alphanumeric or an underscore [a-zA-Z0-9\_]
So to answer your specific questions: capital letters are fine, special characters should be avoided.
Thanks,
Jane
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### Author:  [@gm\_shack](https://community.thunkable.com/u/gm_shack)
#### Post date: [February 15, 2021, 4:25pm UTC](https://community.thunkable.com/t/can-i-have-capital-letters-and-special-characters-in-my-package-id-for-publishing-in-play-store/1098495/3 "2021-02-15T16:25:29Z")
So I can use underscores too right??
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### Author:  [@ioannis](https://community.thunkable.com/u/ioannis)
#### Post date: [November 8, 2024, 1:29pm UTC](https://community.thunkable.com/t/can-i-have-capital-letters-and-special-characters-in-my-package-id-for-publishing-in-play-store/1098495/4 "2024-11-08T13:29:26Z")