diff --git a/docs/api/web-contents.md b/docs/api/web-contents.md
index 2163678d82b4..8d1b4caa36cf 100644
--- a/docs/api/web-contents.md
+++ b/docs/api/web-contents.md
@@ -1135,6 +1135,7 @@ Disable device emulation enabled by `webContents.enableDeviceEmulation`.
     `numLock`, `left`, `right`.
 
 Sends an input `event` to the page.
+'BrowserWindow` needs to be focused for `sendInputEvent()` to work.
 
 For keyboard events, the `event` object also have following properties: