diff --git a/.readthedocs.yml b/.readthedocs.yml
index 0757b52..9da4ebc 100644
--- a/.readthedocs.yml
+++ b/.readthedocs.yml
@@ -6,11 +6,20 @@ version: 2
 # Only compile HTML
 formats: []
 
+build:
+   os: 'ubuntu-24.04'
+   tools:
+      python: '3.13'
+
 python:
-   version: 3.8
    install:
       - requirements: docs/requirements_for_rtd.txt
       - method: pip
         path: .
-        #extra_requirements:
-        #    - docs
+        extra_requirements:
+           - 'bz'
+
+sphinx:
+   configuration: 'docs/source/conf.py'
+   builder: 'html'
+   fail_on_warning: false
diff --git a/docs/source/conf.py b/docs/source/conf.py
index 0a608bf..8436b84 100755
--- a/docs/source/conf.py
+++ b/docs/source/conf.py
@@ -33,7 +33,7 @@
 templates_path = ['_templates']
 
 # The suffix of source filenames.
-source_suffix = '.rst'
+source_suffix = {'.rst': 'restructuredtext'}
 
 # The encoding of source files.
 # source_encoding = 'utf-8-sig'
@@ -67,7 +67,7 @@
 #
 # This is also used if you do content translation via gettext catalogs.
 # Usually you set "language" from the command line for these cases.
-language = None
+language = 'en'
 
 # There are two options for replacing |today|: either, you set today to some
 # non-false value, then it is used:
diff --git a/docs/source/module_guide/index.rst b/docs/source/module_guide/index.rst
index b179216..01ab808 100644
--- a/docs/source/module_guide/index.rst
+++ b/docs/source/module_guide/index.rst
@@ -20,3 +20,9 @@ The HPKOT module
 
 .. automodule:: seekpath.hpkot.tools
    :members:
+
+
+Warnings
+--------
+
+.. autoclass:: seekpath.SupercellWarning