"will append" is correct and usable in written English.
You can use it when describing an action that will be taken in the future. For example: "The document will append to the end of the report."
Mr. Clinton will append the trip to his last summit meeting with Asian leaders, which this year will take place in the tiny, oil-rich sultanate of Brunei on Nov. 15 and 16.
To make hackers' jobs more difficult, diligent companies will append a series of random digits to the end of each hashed value, a process known as "salting," which requires only a few more lines of code and can be done at no cost.
If you rent a film from Netflix, Swurl will append a link to the movie's trailer on YouTube.
But last week, Israel and the European Union came to an agreement: The E.U. rule would still apply, but Israel will append to the agreement a statement saying that it does not agree with the guidelines.
When a given vehicle encounters a traffic event and detects it, the given ERS will append its vehicle's identity into the event confidence list field at the corresponding event entry.
When a given vehicle detects a traffic event by sensor, the given ERS will append its vehicle's identity into the relevant field in the event confidence list at the corresponding event entry.
Then, when you contact a broker or landlord through Lovely, it'll append this resume to your message.
2tweet will use the first 113 characters of the Email's subject line to lead off the tweet, and will then append a link to your web gallery.
Answering our questions, he will sometimes append an anecdote with an exclamatory question.
"I said, Jews will never append additional signalization to qualify irony.
Facebook will then append "traveling to Boston" with a little plane icon.
