Define which file's change should trigger the need of gradle sync

Hi,

Is there any way one can define which files should be checked by the IDE to look for changes in order to trigger gradle sync? I have a dependencies.gradle where I list all of my dependencies, and I would like to be able to "make the project out-dated" once a change in that file occurs, the same as it happens with build.gradle files. 

Is there a way to do that?

Thanks in advance.