diff --git a/rem/aufile/aufile.c b/rem/aufile/aufile.c
index f5ceb7eaa..8f18e0a35 100644
--- a/rem/aufile/aufile.c
+++ b/rem/aufile/aufile.c
@@ -271,6 +271,7 @@ size_t aufile_get_length(struct aufile *af, const struct aufile_prm *prm)
  *
  * @param af  Audio-file
  * @param prm Audio file parameters from aufile_open
+ * @param pos_ms Playing position in milliseconds
  *
  * @return 0 if success, otherwise errorcode
  */