diff --git a/self-host/customize-deployment/environment-variables.mdx b/self-host/customize-deployment/environment-variables.mdx
index ab2d6a65..39df3b55 100644
--- a/self-host/customize-deployment/environment-variables.mdx
+++ b/self-host/customize-deployment/environment-variables.mdx
@@ -285,9 +285,10 @@ If you want to expose multiple models through the proxy, use `OPENAI_AVAILABLE_M
 
 | Variable                     | Description                                                                                 |
 | ---------------------------- | ------------------------------------------------------------------------------------------- |
-| `ANTHROPIC_API_KEY`          | (Required when using Anthropic) API key for Anthropic                                       |
-| `ANTHROPIC_MODEL_NAME`       | Anthropic model name to use (default=claude-sonnet-4-5)                                     |
-| `ANTHROPIC_AVAILABLE_MODELS` | Comma-separated list of models available in the model picker (default=All supported models) |
+| `ANTHROPIC_API_KEY`              | (Required when using Anthropic) API key for Anthropic                                       |
+| `ANTHROPIC_MODEL_NAME`           | Anthropic model name to use (default=claude-sonnet-4-5)                                     |
+| `ANTHROPIC_AVAILABLE_MODELS`     | Comma-separated list of models available in the model picker (default=All supported models) |
+| `AI_WRITEBACK_ANTHROPIC_API_KEY` | (Required for AI writeback) Dedicated Anthropic API key used by the AI writeback feature. Kept separate from `ANTHROPIC_API_KEY` so writeback and AI Analyst have independent spend caps and fail independently. |
 
 #### Azure AI Configuration