diff --git a/docs/source/main-algorithms/core-classes/delta.rst b/docs/source/main-algorithms/core-classes/delta.rst
new file mode 100644
index 000000000..1986cd2f0
--- /dev/null
+++ b/docs/source/main-algorithms/core-classes/delta.rst
@@ -0,0 +1,15 @@
+..
+    Copyright (c) 2025 Joseph Edwards
+
+    Distributed under the terms of the GPL license version 3.
+
+    The full license is in the file LICENSE, distributed with this software.
+
+.. currentmodule:: _libsemigroups_pybind11
+
+The delta function
+==================
+
+This page contains the documentation for the :py:func:`delta` function. 
+
+.. autofunction:: delta
diff --git a/docs/source/main-algorithms/core-classes/index.rst b/docs/source/main-algorithms/core-classes/index.rst
index b382814b9..519644294 100644
--- a/docs/source/main-algorithms/core-classes/index.rst
+++ b/docs/source/main-algorithms/core-classes/index.rst
@@ -20,6 +20,7 @@ pages.
 .. toctree::
     :maxdepth: 1
 
+    delta
     reporter
     report-guard
-    runner
\ No newline at end of file
+    runner
diff --git a/docs/source/main-algorithms/core-classes/reporter.rst b/docs/source/main-algorithms/core-classes/reporter.rst
index a776ffb3c..6d6ef29cc 100644
--- a/docs/source/main-algorithms/core-classes/reporter.rst
+++ b/docs/source/main-algorithms/core-classes/reporter.rst
@@ -5,7 +5,7 @@
 
     The full license is in the file LICENSE, distributed with this software.
 
-.. currentmodule:: _libsemigroups_pybind11
+.. currentmodule:: libsemigroups_pybind11
 
 The Reporter class
 ==================
diff --git a/docs/source/main-algorithms/core-classes/runner.rst b/docs/source/main-algorithms/core-classes/runner.rst
index d92ed05db..ccb865a7d 100644
--- a/docs/source/main-algorithms/core-classes/runner.rst
+++ b/docs/source/main-algorithms/core-classes/runner.rst
@@ -5,7 +5,7 @@
 
     The full license is in the file LICENSE, distributed with this software.
 
-.. currentmodule:: _libsemigroups_pybind11
+.. currentmodule:: libsemigroups_pybind11
 
 The Runner class
 ================
diff --git a/src/libsemigroups_pybind11/__init__.py b/src/libsemigroups_pybind11/__init__.py
index 387639460..5ad2f9f6d 100644
--- a/src/libsemigroups_pybind11/__init__.py
+++ b/src/libsemigroups_pybind11/__init__.py
@@ -70,6 +70,8 @@
         Paths,
         PositiveInfinity,
         ReportGuard,
+        Reporter,
+        Runner,
         StringRange,
         ToString,
         ToWord,
@@ -79,6 +81,7 @@
         WordGraph,
         WordRange,
         congruence_kind,
+        delta,
         error_message_with_prefix,
         freeband_equal_to,
         lexicographical_compare,
diff --git a/tests/test_runner.py b/tests/test_runner.py
index 373af7606..133ad5674 100644
--- a/tests/test_runner.py
+++ b/tests/test_runner.py
@@ -13,10 +13,7 @@
 
 from datetime import timedelta
 
-from _libsemigroups_pybind11 import (  # pylint: disable=no-name-in-module
-    Reporter,
-    delta,
-)
+from libsemigroups_pybind11 import Reporter, delta
 
 
 def test_reporter_000():
diff --git a/tests/test_to.py b/tests/test_to.py
index 8dd07f252..f1e05a504 100644
--- a/tests/test_to.py
+++ b/tests/test_to.py
@@ -12,6 +12,9 @@
 """
 
 import pytest
+
+# TODO(1) be good to remove the imports from _libsemigroups_pybind11, but
+# couldn't immediately figure out how to.
 from _libsemigroups_pybind11 import (
     FroidurePinKBEStringRewriteFromLeft,
     FroidurePinKBEStringRewriteTrie,