Build Trigger Settings

I am a new user to teamcity and I am trying to set some vcs triggers. Currently the build runs everytime a file is checked in.
I do not want the build to run when a document file is checked-in, added or deleted.

Settings in VCS Root

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Type of VCS: Subversion

VCS root name: test_build_svn_1

URL: https://.../svn/test_repository/trunk

I also have read the sections on VCS trigger and have set a VCS trigger for the build.

Here is the trigger rule I set so the build does not start

+:.

-:man_pages/**

if I update the folder called /man_pages (which resides under \trunk\man_pages) by deleting or adding a file to it still triggers the build.

I also have tried

-:root=test_build_svn_1:man_pages/**

or

-:root=test_build_svn_1:man_pages/*.txt

or

-:root=test_build_svn_1:**/man_pages/**

Any suggestions?

Thanks

Ernest