1 files changed, 2 insertions, 0 deletions
diff --git a/include/rtdef.h b/include/rtdef.h
index ffafa5db1d..31341759bf 100644
--- a/include/rtdef.h
+++ b/include/rtdef.h
@@ -570,6 +570,8 @@ typedef struct rt_timer *rt_timer_t;
 /**
  * @addtogroup Signal
  */
+/**@{*/
+
 #ifdef RT_USING_SIGNALS
 #include <sys/signal.h>
 typedef unsigned long rt_sigset_t;