How to refresh a eclipse project built from ant build file?

I created a new project in eclipse using an existing ant build file (using the eclipse feature).

Is there a way to refresh the project, if the ant build file is modified?

For example, there were new build path dependencies added to the 开发者_C百科build.xml but in eclipse those files were not added to the project build path.

I believe once the project has been created you have to keep them up to sync manually. Either that, or delete the project in eclipse and create a New project from the newly updated ant file.