sbt目录结构中的非托管jar的lib目录到哪里去了?

I'm trying to add jar files to an sbt project, but I can't figure out where to store them. The sbt docs say "Just drop them in the lib folder, and you're good!", but don't give any information about where to actually put this lib folder. Does the lib folder go under src? at the top level hierarchy where the src folder is located? I'm really not sure, and would appreciate some help.I'm trying to add jar files to an sbt project,