Correct

函告

/ hán gào / 
Strokes

Example

As a Verb

inform by letter

1
Dāi
待
xíngchéng
行程
quèdìng
确定
hòu
后
  
,
dāngjí
当即
hángào
函告
  
。

I'll write to inform you of my itinerary once it is set.