I'm running the latest OS X (10.8.1). Yesterday I discovered the Spotlight Comments feature, so I went through many of my Applications and put useful comments in that field. For example, on Music Manager.app, I put the spotlight comment "google music", since it's Google Music's manager app and I would want that to appear in my search results.
It's been at least a day now and I still don't see it when I do a spotlight search for "google music". What am I doing wrong? How long does it take for Spotlight to realize applications have comments and index them?