diff --git a/src/pv/transfer.c b/src/pv/transfer.c
index 3480521..12389d5 100644
--- a/src/pv/transfer.c
+++ b/src/pv/transfer.c
@@ -790,7 +790,7 @@ static int pv__transfer_write(pvstate_t state, bool *eof_in, bool *eof_out, long
 	}
 
 	/*
-	 * If we reach this point, nwritten<0, so there may be an error.
+	 * If we reach this point, nwritten<=0, so there may be an error.
 	 */
 
 	/*