Issue #28003: Implement PEP 525 -- Asynchronous Generators.
diff --git a/Lib/dis.py b/Lib/dis.py
index 59886f1..556d84e 100644
--- a/Lib/dis.py
+++ b/Lib/dis.py
@@ -87,6 +87,7 @@
     64: "NOFREE",
    128: "COROUTINE",
    256: "ITERABLE_COROUTINE",
+   512: "ASYNC_GENERATOR",
 }
 
 def pretty_flags(flags):