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Commons mass description tool is a tool that allows user to add descriptions for multiple files of Wikimedia Commons at once.

You must have Wikimedia single login account first, to be able to access the tool and see where to fix the problem of this task.

The tool interface is at https://tools.wmflabs.org/commons-mass-description/

Visit the above link while logged in your Wikimedia account and allow access to your account.

Once successfully logged in, the OAuth will returns you to the tool with full interface unveiled. Now you will see some radio buttons which allow filtering either by category or uploader of the images. Select "Filter by category."

A one-line description text will appear. This text has typo and your work is to fix it.

Original text: "Enter name of category that you want to use at the source of the table below"

Corrected text should be: "Enter name of category that you want to use as the source of the table below"

The tool source code lives at https://gerrit.wikimedia.org/r/#/admin/projects/labs/tools/commons-mass-description