docs: document frameId meaning (#27189)

Co-authored-by: Jeremy Rose <nornagon@nornagon.net>
electron · Jan 5, 2021 · c68f0f0 · c68f0f0
1 parent a2b61f9
commit c68f0f0
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/docs/api/web-contents.md b/docs/api/web-contents.md
@@ -1622,7 +1622,9 @@ 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[]