diff --git a/docs/api/context-bridge.md b/docs/api/context-bridge.md
index 93949d374a292..6699d5ef59fdf 100644
--- a/docs/api/context-bridge.md
+++ b/docs/api/context-bridge.md
@@ -48,7 +48,7 @@ The `contextBridge` module has the following methods:
 
 ### `contextBridge.exposeInIsolatedWorld(worldId, apiKey, api)`
 
-* `worldId` Integer - The ID of the world to inject the API into. This has to be an existing world.
+* `worldId` Integer - The ID of the world to inject the API into. This has to be an existing world. 0 is the default world, 999 is the world used by Electrons contextIsolation feature. Chrome extensions reserve the range of IDs in [1 << 20, 1 << 29). You can provide any integer here.
 * `apiKey` string - The key to inject the API onto `window` with.  The API will be accessible on `window[apiKey]`.
 * `api` any - Your API, more information on what this API can be and how it works is available below.