diff --git a/src/signal.c b/src/signal.c
index 8402591..1d11617 100644
--- a/src/signal.c
+++ b/src/signal.c
@@ -27,7 +27,9 @@
 
 /*! \addtogroup signal
  *  @{
+ *  \brief Generic signalling/notification infrastructure
  */
+
 /*! \file signal.c */