diff --git a/model/src/pyrenew/latent/hospitaladmissions.py b/model/src/pyrenew/latent/hospitaladmissions.py
index c6bc9028..359d293f 100644
--- a/model/src/pyrenew/latent/hospitaladmissions.py
+++ b/model/src/pyrenew/latent/hospitaladmissions.py
@@ -7,7 +7,7 @@
 import numpyro.distributions as dist
 from numpy.typing import ArrayLike
 from pyrenew.distutil import validate_discrete_dist_vector
-from pyrenew.metaclasses import RandomVariable
+from pyrenew.metaclass import RandomVariable
 
 HospAdmissionsSample = namedtuple(
     "HospAdmissionsSample",
diff --git a/model/src/pyrenew/latent/infections.py b/model/src/pyrenew/latent/infections.py
index 409981de..19706e8c 100644
--- a/model/src/pyrenew/latent/infections.py
+++ b/model/src/pyrenew/latent/infections.py
@@ -11,7 +11,7 @@
     reverse_discrete_dist_vector,
     validate_discrete_dist_vector,
 )
-from pyrenew.metaclasses import RandomVariable
+from pyrenew.metaclass import RandomVariable
 
 InfectionsSample = namedtuple(
     "InfectionsSample",
diff --git a/model/src/pyrenew/metaclasses.py b/model/src/pyrenew/metaclass.py
similarity index 99%
rename from model/src/pyrenew/metaclasses.py
rename to model/src/pyrenew/metaclass.py
index 7ea4e40f..96b337e0 100644
--- a/model/src/pyrenew/metaclasses.py
+++ b/model/src/pyrenew/metaclass.py
@@ -1,7 +1,7 @@
 # -*- coding: utf-8 -*-
 
 """
-Observation helper classes
+pyrenew helper classes
 """
 
 from abc import ABCMeta, abstractmethod
diff --git a/model/src/pyrenew/model/hospitalizations.py b/model/src/pyrenew/model/hospitalizations.py
index 651c721d..26ea5609 100644
--- a/model/src/pyrenew/model/hospitalizations.py
+++ b/model/src/pyrenew/model/hospitalizations.py
@@ -2,7 +2,7 @@
 
 from collections import namedtuple
 
-from pyrenew.metaclasses import Model, RandomVariable, _assert_sample_and_rtype
+from pyrenew.metaclass import Model, RandomVariable, _assert_sample_and_rtype
 from pyrenew.model.rtinfectionsrenewal import RtInfectionsRenewalModel
 from pyrenew.process import RtRandomWalkProcess
 
diff --git a/model/src/pyrenew/model/rtinfectionsrenewal.py b/model/src/pyrenew/model/rtinfectionsrenewal.py
index 3e132ee0..e302bf29 100644
--- a/model/src/pyrenew/model/rtinfectionsrenewal.py
+++ b/model/src/pyrenew/model/rtinfectionsrenewal.py
@@ -2,7 +2,7 @@
 
 from collections import namedtuple
 
-from pyrenew.metaclasses import Model, RandomVariable, _assert_sample_and_rtype
+from pyrenew.metaclass import Model, RandomVariable, _assert_sample_and_rtype
 from pyrenew.process import RtRandomWalkProcess
 
 # Output class of the RtInfectionsRenewalModel
diff --git a/model/src/pyrenew/observation/negativebinomial.py b/model/src/pyrenew/observation/negativebinomial.py
index e5a7cff5..1aa416bc 100644
--- a/model/src/pyrenew/observation/negativebinomial.py
+++ b/model/src/pyrenew/observation/negativebinomial.py
@@ -5,7 +5,7 @@
 import numpyro
 import numpyro.distributions as dist
 from numpy.typing import ArrayLike
-from pyrenew.metaclasses import RandomVariable
+from pyrenew.metaclass import RandomVariable
 
 
 class NegativeBinomialObservation(RandomVariable):
diff --git a/model/src/pyrenew/observation/poisson.py b/model/src/pyrenew/observation/poisson.py
index e687b9b6..f580eaec 100644
--- a/model/src/pyrenew/observation/poisson.py
+++ b/model/src/pyrenew/observation/poisson.py
@@ -2,7 +2,7 @@
 
 import numpyro
 import numpyro.distributions as dist
-from pyrenew.metaclasses import RandomVariable
+from pyrenew.metaclass import RandomVariable
 
 
 class PoissonObservation(RandomVariable):
diff --git a/model/src/pyrenew/process/ar.py b/model/src/pyrenew/process/ar.py
index 8720945f..7d3d2969 100644
--- a/model/src/pyrenew/process/ar.py
+++ b/model/src/pyrenew/process/ar.py
@@ -5,7 +5,7 @@
 import numpyro.distributions as dist
 from jax import lax
 from numpy.typing import ArrayLike
-from pyrenew.metaclasses import RandomVariable
+from pyrenew.metaclass import RandomVariable
 
 
 class ARProcess(RandomVariable):
diff --git a/model/src/pyrenew/process/firstdifferencear.py b/model/src/pyrenew/process/firstdifferencear.py
index afe31c32..5e71c027 100644
--- a/model/src/pyrenew/process/firstdifferencear.py
+++ b/model/src/pyrenew/process/firstdifferencear.py
@@ -2,7 +2,7 @@
 
 import jax.numpy as jnp
 from numpy.typing import ArrayLike
-from pyrenew.metaclasses import RandomVariable
+from pyrenew.metaclass import RandomVariable
 from pyrenew.process import ARProcess
 
 
diff --git a/model/src/pyrenew/process/rtrandomwalk.py b/model/src/pyrenew/process/rtrandomwalk.py
index b0028335..55d452ba 100644
--- a/model/src/pyrenew/process/rtrandomwalk.py
+++ b/model/src/pyrenew/process/rtrandomwalk.py
@@ -2,7 +2,7 @@
 
 import numpyro as npro
 import numpyro.distributions as dist
-from pyrenew.metaclasses import RandomVariable
+from pyrenew.metaclass import RandomVariable
 from pyrenew.process.simplerandomwalk import SimpleRandomWalkProcess
 from pyrenew.transform import AbstractTransform, LogTransform
 
diff --git a/model/src/pyrenew/process/simplerandomwalk.py b/model/src/pyrenew/process/simplerandomwalk.py
index c8227423..8f249c1d 100644
--- a/model/src/pyrenew/process/simplerandomwalk.py
+++ b/model/src/pyrenew/process/simplerandomwalk.py
@@ -3,7 +3,7 @@
 import jax.numpy as jnp
 import numpyro as npro
 import numpyro.distributions as dist
-from pyrenew.metaclasses import RandomVariable
+from pyrenew.metaclass import RandomVariable
 
 
 class SimpleRandomWalkProcess(RandomVariable):