diff --git a/packages/web/server/lib/opencode/DOCUMENTATION.md b/packages/web/server/lib/opencode/DOCUMENTATION.md
index 814d1a76..66b0393b 100644
--- a/packages/web/server/lib/opencode/DOCUMENTATION.md
+++ b/packages/web/server/lib/opencode/DOCUMENTATION.md
@@ -63,8 +63,8 @@ This module provides OpenCode server integration utilities for the web server ru
 
 ## Public exports (providers.js)
 - `getProviderSources(providerId, workingDirectory)`: Resolves which OpenCode config layers define a provider.
-- `upsertProviderConfig(providerId, config, workingDirectory, scope?, options?)`: Validates and writes a custom OpenAI-compatible provider block (`npm`, `name`, `options.baseURL`, `models`, optional `env`/`headers`) into the user/project/custom config layer. Existing provider, option, and retained-model fields not managed by the form are preserved; omitted models, headers, and env credentials remain explicit removals. Updating a legacy `providers` entry migrates it to the canonical `provider` key. Does not store API keys. Requires `config.env` or `options.hasStoredAuth` (auth already written via OpenCode `auth.set`). Edit flows must pass the provider's effective existing layer (`custom` > `project` > `user`) so updates do not create a global user override.
-- `validateCustomProviderConfig(providerId, config, options?)`: Structural validation for custom provider payloads (id format, http(s) base URL, models, credentials via `env` or `hasStoredAuth`).
+- `upsertProviderConfig(providerId, config, workingDirectory, scope?, options?)`: Validates and writes a custom provider block (`npm`, `name`, `options.baseURL`, `models`, optional `env`/`headers`) into the user/project/custom config layer. The adapter may be OpenAI Chat Completions, OpenAI Responses, or Anthropic Messages. Existing provider, option, and retained-model fields not managed by the form are preserved; omitted models, headers, and env credentials remain explicit removals. Updating a legacy `providers` entry migrates it to the canonical `provider` key. Does not store API keys. Requires `config.env` or `options.hasStoredAuth` (auth already written via OpenCode `auth.set`). Edit flows must pass the provider's effective existing layer (`custom` > `project` > `user`) so updates do not create a global user override.
+- `validateCustomProviderConfig(providerId, config, options?)`: Structural validation for custom provider payloads (id format, adapter allowlist `@ai-sdk/openai-compatible`/`@ai-sdk/openai`/`@ai-sdk/anthropic`, http(s) base URL, models, credentials via `env` or `hasStoredAuth`).
 - `removeProviderConfig(providerId, workingDirectory, scope?)`: Removes a provider block from the selected config layer.
 
 ## Public exports (shared.js)