diff --git a/rainbowadn/collection/trees/binary/actions/__init__.py b/rainbowadn/collection/trees/binary/actions/__init__.py
index 0fabb60..b2d5461 100644
--- a/rainbowadn/collection/trees/binary/actions/__init__.py
+++ b/rainbowadn/collection/trees/binary/actions/__init__.py
@@ -1,11 +1,11 @@
 __all__ = (
     'BinaryAction',
     'CompareAction',
-    'AddAction', 'RemoveAction', 'ContainsAction', 'SplitAction', 'UnionAction',
+    'AddAction', 'RemoveAction', 'ContainsAction', 'SplitAction', 'UnionAction', 'MergeAction',
     'Symmetric', 'InnerOuter', 'OuterInner',
 )
 
 from .binaryaction import BinaryAction
 from .compareaction import CompareAction
-from .stdactions import AddAction, ContainsAction, RemoveAction, SplitAction, UnionAction
+from .stdactions import AddAction, ContainsAction, MergeAction, RemoveAction, SplitAction, UnionAction
 from .symmetric import InnerOuter, OuterInner, Symmetric
diff --git a/rainbowadn/collection/trees/binary/actions/stdactions.py b/rainbowadn/collection/trees/binary/actions/stdactions.py
index bf62f42..5961af2 100644
--- a/rainbowadn/collection/trees/binary/actions/stdactions.py
+++ b/rainbowadn/collection/trees/binary/actions/stdactions.py
@@ -6,7 +6,7 @@ from rainbowadn.core import *
 from .binaryaction import *
 from .compareaction import *
 
-__all__ = ('AddAction', 'RemoveAction', 'ContainsAction', 'SplitAction', 'UnionAction',)
+__all__ = ('AddAction', 'RemoveAction', 'ContainsAction', 'SplitAction', 'UnionAction', 'MergeAction',)
 
 TreeType = TypeVar('TreeType')
 ActiveKeyType = TypeVar('ActiveKeyType')