diff --git a/docs/api/web-contents.md b/docs/api/web-contents.md
index 34a567f20571..fd7b0186b022 100644
--- a/docs/api/web-contents.md
+++ b/docs/api/web-contents.md
@@ -1710,7 +1710,9 @@ app.whenReady().then(() => {
 
 #### `contents.sendToFrame(frameId, channel, ...args)`
 
-* `frameId` Integer | [number, number]
+* `frameId` Integer | [number, number] - the ID of the frame to send to, or a
+  pair of `[processId, frameId]` if the frame is in a different process to the
+  main frame.
 * `channel` String
 * `...args` any[]