Is there a way Spotlight indexes my Skim bookmarks/notes ?

I find Skim is a great pdf file reader and want to spend a great deal of time adding notes and bookmarks to some of the pdf files I have. I know Spotlight indexes pdf files but it doesn't seem to index my Skim bookmarks. (I just created a bookmark in Skim and search for that bookmark in Spotlight. No results). I may force Spotlight to index net.sourceforge.skim-app.skim.bookmarks.plist (it is where bookmarks are stored) ? What do you think ? Thanks in advance.