when merging from branch, the directory that I didn't create is shown

I'm working on IntelliJ on window7. merging from the branch on my trunk with 7 files. but like below image, 7 files and 1 directory are displayed on changes. this directory, I didn't create.

I think this directory isn't physical directory, it's just meta data file. do you explain this situation and it directory's meaning?

thanks.

It looks like a property-only change to the directory. It adds svn:mergeinfo property as a merge result.

SVNBook | Merge and previews:

The svn:mergeinfo property is automatically maintained by Subversion whenever you run svn merge. Its value indicates which changes made to a given path have been replicated into the directory in question.