diff --git a/content/images/deprecated-config-file-without-sphinx-or-mkdocs-config.jpg b/content/images/deprecated-config-file-without-sphinx-or-mkdocs-config.jpg
new file mode 100644
index 0000000..20aecd7
Binary files /dev/null and b/content/images/deprecated-config-file-without-sphinx-or-mkdocs-config.jpg differ
diff --git a/content/posts/deprecate-config-files-without-sphinx-or-mkdocs-config.md b/content/posts/deprecate-config-files-without-sphinx-or-mkdocs-config.md
new file mode 100644
index 0000000..11c716b
--- /dev/null
+++ b/content/posts/deprecate-config-files-without-sphinx-or-mkdocs-config.md
@@ -0,0 +1,47 @@
+title: Deprecation of projects using Sphinx or MkDocs without an explicit configuration file
+date: December 16, 2024
+description: Announcing the deprecation of projects using Sphinx or MkDocs without an explicit configuration in their configuration file.
+category: Changelog
+tags: deprecation, configuration-file
+authors: Santos Gallegos
+status: published
+image: /images/deprecated-config-file-without-sphinx-or-mkdocs-config.jpg
+image_credit: Photo by <a href="https://unsplash.com/@jernejgraj?utm_content=creditCopyText&utm_medium=referral&utm_source=unsplash">Jernej Graj</a> on <a href="https://unsplash.com/photos/photo-of-seashore-during-golden-hour-n44KHcbp1_E?utm_content=creditCopyText&utm_medium=referral&utm_source=unsplash">Unsplash</a>
+
+We are announcing the deprecation of projects using Sphinx or MkDocs without an explicit configuration in their `.readthedocs.yaml` configuration file.
+
+If you are using Sphinx or MkDocs in your project,
+and your `.readthedocs.yaml` configuration file doesn't contain a `sphinx.configuration` or `mkdocs.configuration` key,
+make sure to add it. For example, for a Sphinx project, your configuration file should look like this:
+
+```yaml
+version: 2
+sphinx:
+  # Path to your Sphinx configuration file.
+  configuration: docs/conf.py
+```
+
+For a MkDocs project, your configuration file should look like this:
+
+```yaml
+version: 2
+mkdocs:
+  # Path to your MkDocs configuration file.
+  configuration: mkdocs.yml
+```
+
+We used to automatically try to find the configuration file for your project,
+but in order to make builds more explicit and predictable, we are deprecating this behavior.
+This will also allows us to better support projects that don't use Sphinx or MkDocs in the near future.
+
+If you are using the `build.commands` feature, you don't need to make any changes,
+as the `sphinx` and `mkdocs` options are not required when using `build.commands`.
+
+Deprecation timeline
+--------------------
+
+We will disallow building projects using Sphinx or MkDocs without an explicit Sphinx or MkDocs configuration in their configuration file on the following dates:
+
+- **Monday, January 6, 2025**: Temporarily disallow building projects for 12 hours, from 00:01 PST to 11:59 PST.
+- **Monday, January 13, 2025**:Temporarily disallow building projects for 24 hours, from 00:01 PST to 23:59 PST.
+- **Monday, January 20, 2025**: Permanently disallow building projects.