@@ -1 +0,0 @@
-msmbuilder
@@ -4,6 +4,9 @@
 from openpathsampling.netcdfplus import WeakKeyCache, \
     ObjectJSON, create_to_dict, ObjectStore, PseudoAttribute
 
+from openpathsampling.deprecations import (has_deprecations, deprecate,
+                                           MSMBUILDER)
+
 import sys
 if sys.version_info > (3, ):
     get_code = lambda func: func.__code__
@@ -579,6 +582,8 @@ def to_dict(self):
         }
 
 
+@has_deprecations
+@deprecate(MSMBUILDER)
 class MSMBFeaturizerCV(CoordinateGeneratorCV):
     """
     A CollectiveVariable that uses an MSMBuilder3 featurizer
 
@@ -146,7 +146,15 @@ def version_tuple_to_string(version_tuple):
     deprecated_in=(0, 9 ,3)
 )
 
-# has_deprecation and deprecate hacks to change docstrings inspired by:
+MSMBUILDER = Deprecation(
+    problem=("MSMBuilder is no longer maintained. "
+             + "MSMBFeaturizer is no longer officially supported."),
+    remedy="Create a CoordinateFunctionCV based on MSMBuilderFeaturizers.",
+    remove_version=(2, 0),
+    deprecated_in=(1, 1, 0)
+)
+
+# has_deprecations and deprecate hacks to change docstrings inspired by:
 # https://stackoverflow.com/a/47441572/4205735
 def has_deprecations(cls):
     """Decorator to ensure that docstrings get updated for wrapped class"""