diff --git a/kwant/continuum/__init__.py b/kwant/continuum/__init__.py
index 718f50151795830b73df1f9327aa591997d0cbdc..44a3ae40f873ef908b9c72d8c35f2b686ee204d4 100644
--- a/kwant/continuum/__init__.py
+++ b/kwant/continuum/__init__.py
@@ -20,4 +20,4 @@ except ImportError:
 del sys, ExtensionUnavailable
 
 __all__ = ['discretize', 'discretize_symbolic', 'build_discretized',
-           'sympify', 'lambdify']
+           'sympify', 'lambdify', 'momentum_operators', 'position_operators']