diff --git a/website/_includes/model-warnings.md b/website/_includes/model-warnings.md
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+
+
+Aider tries to sanity check that it is configured correctly
+to work with the LLM you specified:
+
+- It checks to see that all required environment variables are set for the model. These variables are required to configure things like API keys, API base URLs, etc.
+These settings are required to be correct.
+- It checks a metadata database to look up the context window size and token costs for the model.
+It's usually OK if this extra metadata isn't available.
+
+Sometimes one or both of these checks will fail, so aider will issue
+some of the following warnings.
+
+## Missing environment variables
+
+```
+Model azure/gpt-4-turbo: Missing these environment variables:
+- AZURE_API_BASE
+- AZURE_API_VERSION
+- AZURE_API_KEY
+```
+
+You need to set the listed environment variables.
+Otherwise you will get error messages when you start chatting with the model.
+
+
+## Unknown which environment variables are required
+
+```
+Model gpt-5: Unknown which environment variables are required.
+```
+
+Aider is unable verify the environment because it doesn't know
+which variables are required for the model.
+If required variables are missing,
+you may get errors when you attempt to chat with the model.
+You can look in the
+[litellm provider documentation](https://docs.litellm.ai/docs/providers)
+to see if the required variables are listed there.
+
+## Context window size and token costs unavailable.
+
+```
+Model foobar: Unknown model, context window size and token costs unavailable.
+```
+
+If you specify a model that aider has never heard of, you will get an
+"unknown model" warning.
+This means aider doesn't know the context window size and token costs
+for that model.
+Some minor functionality will be limited when using such models, but
+it's not really a significant problem.
+
+Aider will also try to suggest similarly named models,
+in case you made a typo or mistake when specifying the model name.
+
+
diff --git a/website/assets/codespaces.mp4 b/website/assets/codespaces.mp4
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diff --git a/website/docs/install/codespaces.md b/website/docs/install/codespaces.md
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+---
+title: GitHub Codespaces
+parent: Installation
+nav_order: 900
+---
+
+# GitHub Codespaces
+
+You can use aider in GitHub Codespaces via the built-in Terminal pane.
+See below for an example,
+but you can see the 
+[main install instructions](/docs/install.html)
+for all the details.
+
+
+<div class="video-container">
+  <video controls>
+    <source src="/assets/codespaces.mp4" type="video/mp4">
+    <a href="/assets/codespaces.mp4">Aider browser UI demo video</a>
+  </video>
+</div>
+
+<style>
+.video-container {
+  position: relative;
+  padding-bottom: 101.89%; /* 1080 / 1060 = 1.0189 */
+  height: 0;
+  overflow: hidden;
+}
+
+.video-container video {
+  position: absolute;
+  top: 0;
+  left: 0;
+  width: 100%;
+  height: 100%;
+}
+</style>
+
diff --git a/website/docs/troubleshooting/support.md b/website/docs/troubleshooting/support.md
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+++ b/website/docs/troubleshooting/support.md
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+---
+parent: Troubleshooting
+nav_order: 30
+---
+
+# Getting help
+
+{% include help.md %}