diff --git a/.github/workflows/osx.yaml b/.github/workflows/osx.yaml
index 6257100bb..e8c7af1ff 100644
--- a/.github/workflows/osx.yaml
+++ b/.github/workflows/osx.yaml
@@ -30,7 +30,7 @@ jobs:
         # For testing 3.11 we need to do something like the below until the next Mathics3 is released
         # python -m pip install -e git+https://github.com/Mathics3/mathics-scanner#egg=Mathics-Scanner[full]
         # python -m pip install -e git+https://github.com/Mathics3/mathics-core#egg=Mathics3[full]
-        git clone --branch doc-code-rebased-rebased https://github.com/Mathics3/mathics-core
+        git clone https://github.com/Mathics3/mathics-core
         (cd mathics-core && pip3 install -e .[full])
         (cd mathics-core && bash ./admin-tools/make-op-tables.sh)
     - name: Install Mathics3 Django
diff --git a/.github/workflows/ubuntu.yml b/.github/workflows/ubuntu.yml
index a38b17ab6..11a13af08 100644
--- a/.github/workflows/ubuntu.yml
+++ b/.github/workflows/ubuntu.yml
@@ -29,7 +29,7 @@ jobs:
         # For testing 3.11 we need to do something like the below until the next Mathics3 is released
         # python -m pip install -e git+https://github.com/Mathics3/mathics-scanner#egg=Mathics-Scanner[full]
         # python -m pip install -e git+https://github.com/Mathics3/mathics-core#egg=Mathics3[full]
-        git clone --branch doc-code-rebased-rebased https://github.com/Mathics3/mathics-core
+        git clone https://github.com/Mathics3/mathics-core
         (cd mathics-core && pip3 install -e .[full])
         (cd mathics-core && bash ./admin-tools/make-op-tables.sh)
     - name: Install Mathics3 Django
diff --git a/.github/workflows/windows.yml b/.github/workflows/windows.yml
index 1aa05578c..1987c8612 100644
--- a/.github/workflows/windows.yml
+++ b/.github/workflows/windows.yml
@@ -32,7 +32,7 @@ jobs:
         # For testing 3.11 we need to do something like the below until the next Mathics3 is released
         # python -m pip install -e git+https://github.com/Mathics3/mathics-scanner#egg=Mathics-Scanner[full]
         # python -m pip install -e git+https://github.com/Mathics3/mathics-core#egg=Mathics3[full]
-        git clone --branch doc-code-rebased-rebased https://github.com/Mathics3/mathics-core
+        git clone https://github.com/Mathics3/mathics-core
         bash -c '(cd mathics-core && pip3 install -e .[full])'
         bash -c '(cd mathics-core && bash ./admin-tools/make-op-tables.sh)'
     - name: Install Mathics3 Django
diff --git a/mathics_django/doc/django_doc.py b/mathics_django/doc/django_doc.py
index fac8d0e28..6dd6ed9da 100644
--- a/mathics_django/doc/django_doc.py
+++ b/mathics_django/doc/django_doc.py
@@ -205,9 +205,17 @@ def get_uri(self) -> str:
 
 
 class DjangoDocPart(DocPart, DjangoDocElement):
+    """
+    Represents one of the main parts of the document customized for Django. Parts
+    can be loaded from a mdoc file, generated automatically from
+    the docstrings of Builtin objects under `mathics.builtin`, or loaded
+    as a Mathics3 module.
+    """
+
+    chapter_class = DjangoDocChapter
+
     def __init__(self, doc, title, is_reference=False):
         super(DjangoDocPart, self).__init__(doc, title, is_reference)
-        self.chapter_class = DjangoDocChapter
 
     def get_collection(self):
         """Return a list of parts in this doc"""