diff --git a/Doc/library/importlib.rst b/Doc/library/importlib.rst
index 1ecee0b..d217b0a 100644
--- a/Doc/library/importlib.rst
+++ b/Doc/library/importlib.rst
@@ -121,6 +121,21 @@
 used by :keyword:`import`. Some subclasses of the core abstract base classes
 are also provided to help in implementing the core ABCs.
 
+ABC hierarchy::
+
+    object
+     +-- Finder
+     |    +-- MetaPathFinder
+     |    +-- PathEntryFinder
+     +-- Loader
+          +-- ResourceLoader --------+
+          +-- InspectLoader          |
+               +-- ExecutionLoader --+
+                                     +-- FileLoader
+                                     +-- SourceLoader
+                                          +-- PyLoader
+                                          +-- PyPycLoader
+
 
 .. class:: Finder