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-rw-r--r--proto/pipe/Doc1
-rw-r--r--proto/pipe/pipe.c12
2 files changed, 13 insertions, 0 deletions
diff --git a/proto/pipe/Doc b/proto/pipe/Doc
index e69de29b..e7a6d6a7 100644
--- a/proto/pipe/Doc
+++ b/proto/pipe/Doc
@@ -0,0 +1 @@
+S pipe.c
diff --git a/proto/pipe/pipe.c b/proto/pipe/pipe.c
index 3f41faaf..f7ba866b 100644
--- a/proto/pipe/pipe.c
+++ b/proto/pipe/pipe.c
@@ -6,6 +6,18 @@
* Can be freely distributed and used under the terms of the GNU GPL.
*/
+/**
+ * DOC: Pipe
+ *
+ * The Pipe protocol is very simple. It just connects to two routing tables
+ * using proto_add_announce_hook() and whenever it receives a rt_notify()
+ * about a change in one of the tables, it converts it to a rte_update()
+ * in the other one.
+ *
+ * To avoid pipe loops, Pipe keeps a `being updated' flag in each routing
+ * table.
+ */
+
#undef LOCAL_DEBUG
#include "nest/bird.h"