piece.go | 6 ++++++

diff --git a/piece.go b/piece.go
index d2211aa0ed040d22dbc351d369840fce59b31757..f112e0bd262c4f194628a54f94af8aa528258090 100644
--- a/piece.go
+++ b/piece.go
@@ -239,6 +239,12 @@ 	ret.Raise(p.priority)
 	return
 }
 
+func (p *Piece) UpdateCompletion() {
+	p.t.cl.lock()
+	defer p.t.cl.unlock()
+	p.t.updatePieceCompletion(p.index)
+}
+
 func (p *Piece) completion() (ret storage.Completion) {
 	ret.Complete = p.t.pieceComplete(p.index)
 	ret.Ok = p.storageCompletionOk