doxygen module cgraph_api

diff --git a/lib/cgraph/cgraph.h b/lib/cgraph/cgraph.h
index cc43f22a64fe3b6bc13c641ff23b760f116aa25f..a0089effdd57a99199f299d29e94b23d6176079c 100644 (file)
--- a/lib/cgraph/cgraph.h
+++ b/lib/cgraph/cgraph.h
@@ -1,9 +1,14 @@
 /**
  * @file
- * @brief abstract graph C library
+ * @brief abstract graph C library, @ref cgraph_api
  *
  * [man 3 cgraph](https://graphviz.org/pdf/cgraph.3.pdf)
  *
+ * @defgroup cgraph_api Cgraph API
+ * @brief Abstract graph C library
+ *
+ * Main types @ref Agraph_t, @ref Agnode_t, @ref Agedge_t.
+ * @{
  */
 
 /*************************************************************************
@@ -483,3 +488,4 @@ and edges are embedded in main graph objects but allocated separately in subgrap
 #ifdef __cplusplus
 }
 #endif
+/// @}