This is a tracking category for CS1 citations that use |editor=, or its aliases. Articles are listed in this category when Module:Citation/CS1 identifies citations that use singular forms of editor name-list parameters to list multiple names. Doing so, corrupts the citation's metadata. Pages in this category should only be added by Module:Citation/CS1.

The citation module code looks for multiple comma or semicolon separator characters in the value assigned to |editor=, |editor-last=, |editor-first=, and enumerated equivalents (e.g. |editor2=, |editor-last2=, |editor-first2=, etc.). This test displays an error message for multiple editors' names in a single parameter, as well as single editor names that include a comma-separated list of post-nominals (|editor=FC White, RN, MD, Ph.D) and comma-separated generational and regnal suffixes (|editor-first=John F., Jr).

To fix these errors in citations:

1. Remove post-nominals.
2. Remove comma separators that precede generational or regnal suffixes.
3. Provide enumerated editor parameters (e.g. either |editor2= or |editor-last2= and |editor-first2=) for each editor of a cited work.
4. When multiple separator characters are legitimately present in a name (commonly a corporate, institutional, or governmental editor), the name may be wrapped in two sets of parentheses (accept-as-written markup) to suppress assignment to this category, like this: |editor=((Federal Ministry of Transport, Building, and Urban Development)).

Pages with this condition are automatically placed in Category:CS1 maint: multiple names: editors list.^[a]

By default, Citation Style 1 and Citation Style 2 error messages are visible to all readers and maintenance messages are hidden from all readers.

To display maintenance messages in the rendered article, include the following text in your common CSS page (common.css) or your specific skin's CSS page and (skin.css).

(Note to new editors: those CSS pages are specific to you, and control your view of pages, by adding to your user account's CSS code. If you have not yet created such a page, then clicking one of the .css links above will yield a page that starts "Wikipedia does not have a user page with this exact name." Click the "Start the User:username/filename page" link, paste the text below, save the page, follow the instructions at the bottom of the new page on bypassing your browser's cache, and finally, in order to see the previously hidden maintenance messages, refresh the page you were editing earlier.)

.mw-parser-output span.cs1-maint {display: inline;} /* display Citation Style 1 maintenance messages */

To display hidden-by-default error messages:

.mw-parser-output span.cs1-hidden-error {display: inline;} /* display hidden Citation Style 1 error messages */

Even with this CSS installed, older pages in Wikipedia's cache may not have been updated to show these error messages even though the page is listed in one of the tracking categories. A null edit will resolve that issue.

After (error and/maintenance) messages are displayed, it might still not be easy to find them in a large article with a lot of citations. Messages can then be found by searching (with Ctrl-F) for "(help)" or "cs1".

To hide normally-displayed error messages:

.mw-parser-output span.cs1-visible-error {display: none;} /* hide Citation Style 1 error messages */

You can personalize the display of these messages (such as changing the color), but you will need to ask someone who knows CSS or at the technical village pump if you do not understand how.

Nota bene: these CSS rules are not obeyed by Navigation popups. They also do not hide script warning messages in the Preview box that begin with "This is only a preview; your changes have not yet been saved".