diff --git a/pyroute2/ndb/main.py b/pyroute2/ndb/main.py
index b9fa2d4a770a55c88988f1ff3ba7d6152a9156e5..f1faf31e48565b009d94a4aac8235f10800df6ad 100644
--- a/pyroute2/ndb/main.py
+++ b/pyroute2/ndb/main.py
@@ -31,39 +31,61 @@ behaves like a simple named tuple.
 
       +---------------------+
       |                     |
+      |                     |
       | `NDB() instance`    |
       |                     |
+      |                     |
       +---------------------+
                  |
                  |
         +-------------------+
       +-------------------+ |
-    +-------------------+ | |-----------+---------------------------+
-    |                   | | |           |                           |
-    | `View()`          | |-+           |                           |
-    |                   |-+             |                           |
-    +-------------------+               |                           |
-                               +------------------+       +-------------------+
-                               |                  |       |                   |
-                               | `.dump()`        |       | `.create()`       |
-                               | `.summary()`     |       | `.__getitem__()`  |
-                               |                  |       |                   |
-                               +------------------+       +-------------------+
-
+    +-------------------+ | |-----------+--------------------------+
+    |                   | | |           |                          |
+    |                   | | |           |                          |
+    | `View()`          | | |           |                          |
+    |                   | |-+           |                          |
+    |                   |-+             |                          |
+    +-------------------+               |                          |
+                               +------------------+       +------------------+
+                               |                  |       |                  |
+                               |                  |       |                  |
+                               | `.dump()`        |       | `.create()`      |
+                               | `.summary()`     |       | `.__getitem__()` |
+                               |                  |       |                  |
+                               |                  |       |                  |
+                               +------------------+       +------------------+
+                                        |                           |
                                         |                           |
                                         v                           v
-                              +-------------------+       +-------------------+
-                              |                   |     +-------------------+ |
-                              | `RecordSet()`     |   +-------------------+ | |
-                              |                   |   | `Interface()`     | | |
-                              +-------------------+   | `Route()`         | |-+
-                                        |             |  ...              |-+
-                                        v             +-------------------+
+                              +-------------------+        +------------------+
+                              |                   |      +------------------+ |
+                              |                   |    +------------------+ | |
+                              | `RecordSet()`     |    | `Interface()`    | | |
+                              |                   |    | `Address()`      | | |
+                              |                   |    | `Route()`        | | |
+                              +-------------------+    | `Neighbour()`    | | |
+                                        |              | `Rule()`         | |-+
+                                        |              |  ...             |-+
+                                        v              +------------------+
                                 +-------------------+
                               +-------------------+ |
                             +-------------------+ | |
+                            | `filter()`        | | |
+                            | `select()`        | | |
+                            | `transform()`     | | |
+                            | `join()`          | |-+
+                            |  ...              |-+
+                            +-------------------+
+                                        |
+                                        v
+                                +-------------------+
+                              +-------------------+ |
+                            +-------------------+ | |
+                            |                   | | |
                             |                   | | |
-                            | `Record()`        | |-+
+                            | `Record()`        | | |
+                            |                   | |-+
                             |                   |-+
                             +-------------------+