diff --git a/src/jnotype/pyramids/__init__.py b/src/jnotype/pyramids/__init__.py
index b12fb4a..1c6c801 100644
--- a/src/jnotype/pyramids/__init__.py
+++ b/src/jnotype/pyramids/__init__.py
@@ -1,7 +1,9 @@
 """Gibbs samplers for Bayesian pyramids."""
 
 from jnotype.pyramids._sampler_fixed import TwoLayerPyramidSampler
+from jnotype.pyramids._sampler_csp import TwoLayerPyramidSamplerNonparametric
 
 __all__ = [
     "TwoLayerPyramidSampler",
+    "TwoLayerPyramidSamplerNonparametric",
 ]