(CNN) The signs at Glacier National Park warning that its signature glaciers would be gone by 2020 are being changed.

The signs in the Montana park were added more than a decade ago to reflect climate change forecasts at the time by the US Geological Survey, park spokeswoman Gina Kurzmen told CNN.

In 2017, the park was told by the agency that the complete melting off of the glaciers was no longer expected to take place so quickly due to changes in the forecast model, Kurzmen said. But tight maintenance budgets made it impossible for the park to immediately change the signs.

The most prominent placards, at St. Mary Visitor Center, were changed last year. Kurzmen says that park is still waiting for budget authorization to update signs at two other locations.

But the glacier warning isn't being removed entirely, she told CNN. Instead, the new signs will say: "When they will completely disappear depends on how and when we act. One thing is consistent: the glaciers in the park are shrinking.

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