Elon Musk may have one more vehicle to introduce in the near future that was mentioned in the second part of his “Master Plan,” which he reportedly released in 2016 and is currently available on the Tesla (TSLA) website.

According to Electrek, the Tesla CEO may release an all-electric transit vehicle, which could be used in the tunnels created by Musk’s Boring Company, specifically at the Las Vegas Convention Center.

Musk has reportedly said the Cybertruck is the last new product to be unveiled by the company for a while, but the Tesla mogul just may be working on another launch that could be revealed at some point as all details within the “Master Plan” have been followed and released to date.

In the plan (via Electrek), it says, “In addition to consumer vehicles, there are two other types of electric vehicle needed: heavy-duty trucks and high passenger-density urban transport. Both are in the early stages of development at Tesla and should be ready for unveiling next year. We believe the Tesla Semi will deliver a substantial reduction in the cost of cargo transport, while increasing safety and making it really fun to operate.”

“The Secret Tesla Motors Master Plan” has reportedly been followed by the electric carmaker for the last 14 years, and has come to fruition with all the vehicles detailed in the document.

To date, Tesla has released the Roadster, Model S, Model 3, and Model Y as well as a solar panel interest, Tesla Energy. More recently, the company introduced the Cybertruck and an electric semi know as the Tesla Semi.

The “Master Plan” also included the introduction of autonomous cars in a shared fleet, which Musk said would happen by the end of 2020, according to the news outlet.

Shares of Tesla stock were up 6.45% as of market close on Monday.