diff --git a/pyangbind/lib/yangtypes.py b/pyangbind/lib/yangtypes.py
index 4308314..e9b4fb9 100644
--- a/pyangbind/lib/yangtypes.py
+++ b/pyangbind/lib/yangtypes.py
@@ -85,6 +85,7 @@
     "property",
     "min",
     "max",
+    "async",
 ]