[2738] Note about libraries

diff --git a/doc/design/ipc-high.txt b/doc/design/ipc-high.txt
index ed0e9c49222064966d76f7a26d95abb8350119bc..d3e22e1504d48f22c6d4c0f935c8fbd24c875238 100644 (file)
--- a/doc/design/ipc-high.txt
+++ b/doc/design/ipc-high.txt
@@ -181,6 +181,9 @@ Notification::
 Details of the higher-level
 ---------------------------
 
+While there are libraries implementing the communication in convenient
+way, it is useful to know what happens inside.
+
 The notifications are probably the simplest. Users interested in
 receiving notifications of some family subscribe to corresponding
 group. Then, a client sends a message to the group. For example, if