doxygen for sfdpgen

diff --git a/lib/sfdpgen/sfdpinit.c b/lib/sfdpgen/sfdpinit.c
index b0b439d504537da5992d3beef790b5125a0cc45c..3f642f7562b567cdb007647db7a1a3a550e94e17 100644 (file)
--- a/lib/sfdpgen/sfdpinit.c
+++ b/lib/sfdpgen/sfdpinit.c
@@ -338,3 +338,12 @@ void sfdp_cleanup(graph_t * g)
     }
 }
  
+/**
+ * @dir lib/sfdpgen
+ * @brief scalable [Force-Directed Placement](https://en.wikipedia.org/wiki/Force-directed_graph_drawing) layout engine, API sfdpgen/sfdp.h
+ * @ingroup engines
+ *
+ * [SFDP layout user manual](https://graphviz.org/docs/layouts/sfdp/)
+ *
+ * Other @ref engines
+ */