file.go | 3 +++

diff --git a/file.go b/file.go
index 41767e664a0f1b1d197f0d828d441e858911b103..7c8a79bb97e7db06296abc58ec087fab2540a18b 100644
--- a/file.go
+++ b/file.go
@@ -75,10 +75,13 @@ 	}
 	return
 }
 
+// Requests that all pieces containing data in the file be downloaded.
 func (f *File) Download() {
 	f.t.DownloadPieces(f.t.torrent.byteRegionPieces(f.offset, f.length))
 }
 
+// Requests that torrent pieces containing bytes in the given region of the
+// file be downloaded.
 func (f *File) PrioritizeRegion(off, len int64) {
 	f.t.DownloadPieces(f.t.torrent.byteRegionPieces(f.offset+off, len))
 }