2 files changed, 23 insertions, 0 deletions
diff --git a/doc/developer/building-libyang.rst b/doc/developer/building-libyang.rst
index 005b6ba786..c45c294b75 100644
--- a/doc/developer/building-libyang.rst
+++ b/doc/developer/building-libyang.rst
@@ -4,6 +4,13 @@ The libyang library can be installed from third-party packages available `here
 Note: the libyang dev/devel packages need to be installed in addition
 to the libyang core package in order to build FRR successfully.
 
+.. warning::
+   libyang ABI version 0.16.74 or newer will be required to build FRR in the
+   near future since it significantly eases build and installation
+   considerations.  "0.16-r3" is equal to 0.16.105 and will work, "0.16-r2"
+   is equal to 0.16.52 and will stop working.  The CI artifacts will be
+   updated shortly.
+
 For example, for CentOS 7.x:
 
 .. code-block:: shell
@@ -21,6 +28,14 @@ or Ubuntu 18.04:
    sudo apt install libpcre3-dev
    sudo dpkg -i libyang-dev_0.16.46_amd64.deb libyang_0.16.46_amd64.deb
 
+.. note::
+   For Debian-based systems, the official libyang package requires recent
+   versions of swig (3.0.12) and debhelper (11) which are only available in
+   Debian buster (10).  However, libyang packages built on Debian buster can
+   be installed on both Debian jessie (8) and Debian stretch (9), as well as
+   various Ubuntu systems.  The python3-yang package will not work, but the
+   other packages (libyang-dev is the one needed for FRR) will.
+
 Alternatively, libyang can be built and installed manually by following
 the steps below:
 
diff --git a/doc/developer/modules.rst b/doc/developer/modules.rst
index 99c79462ab..763d8b1b8d 100644
--- a/doc/developer/modules.rst
+++ b/doc/developer/modules.rst
@@ -53,6 +53,14 @@ Basic boilerplate:
 
     #include "hook.h"
     #include "module.h"
+    #include "libfrr.h"
+    #include "thread.h"
+
+    static int module_late_init(struct thread_master *master)
+    {
+        /* Do initialization stuff here */
+        return 0;
+    }
 
     static int
     module_init (void)