torrent.go | 9 +++++++++

diff --git a/torrent.go b/torrent.go
index 1e47f5e4073b4b92329c5a4dac509d85f479aa37..bfa84366aa4a8cd7aa7392e77e66af8dfcf0a8ba 100644
--- a/torrent.go
+++ b/torrent.go
@@ -149,6 +149,9 @@ 	// Chunks we've written to since the corresponding piece was last checked.
 	dirtyChunks roaring.Bitmap
 
 	pex pexState
+
+	// Is On when all pieces are complete.
+	Complete chansync.Flag
 }
 
 func (t *Torrent) pieceAvailabilityFromPeers(i pieceIndex) (count int) {
@@ -413,6 +416,7 @@ 	}
 	t.nameMu.Lock()
 	t.info = info
 	t.nameMu.Unlock()
+	t.updateComplete()
 	t.fileIndex = segments.NewIndex(common.LengthIterFromUpvertedFiles(info.UpvertedFiles()))
 	t.displayName = "" // Save a few bytes lol.
 	t.initFiles()
@@ -1264,6 +1268,7 @@ 		t._completedPieces.Add(x)
 	} else {
 		t._completedPieces.Remove(x)
 	}
+	t.updateComplete()
 	if complete && len(p.dirtiers) != 0 {
 		t.logger.Printf("marked piece %v complete but still has dirtiers", piece)
 	}
@@ -2289,3 +2294,7 @@
 func (t *Torrent) pieceRequestIndexOffset(piece pieceIndex) RequestIndex {
 	return RequestIndex(piece) * t.chunksPerRegularPiece()
 }
+
+func (t *Torrent) updateComplete() {
+	t.Complete.SetBool(t.haveAllPieces())
+}