diff --git a/src/sim/card_fs_usim.c b/src/sim/card_fs_usim.c
index 22c193f..9e9fc87 100644
--- a/src/sim/card_fs_usim.c
+++ b/src/sim/card_fs_usim.c
@@ -1,4 +1,5 @@
-/* 3GPP USIM specific structures / routines */
+/*! \file card_fs_usim.c
+ * 3GPP USIM specific structures / routines. */
 /*
  * (C) 2012-2014 by Harald Welte <laforge@gnumonks.org>
  *