Namespace dependencies not required: 'limma', 'survival'

I used check() function to check my package.
There is an error "Namespace dependencies not required: 'limma', 'survival'"
So what's the problem?

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You have imported a function from limma or survival but have not put those packages in your DESCRIPTION file. You can use usethis::use_package("limma") etc. to add them to the file. See also the Automated checks section of the r-pkgs book.

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Thank you ! Your solution helped me.

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