Buried in SpaceX's amended IPO filing was a major increase in the company's revolving credit facility.

The Elon Musk-led company expanded the facility from $1.5 billion to $5 billion.

That's a 233% jump that significantly boosts the company's financial flexibility as it prepares to enter the public markets.

The move raises an obvious question: Why does a company heading toward one of the largest IPOs in history need even more firepower?

A Much Bigger War Chest Isn't Trivial The aerospace and space transportation company more than tripled its revolving borrowing capacity while also doubling its letter-of-credit capacity from $1 billion to $2 billion and extending the facility's maturity to 2031.