Billionaire Warren Buffett announced that he has been diagnosed with prostate cancer.

The 81-year-old Buffett stresses in the letter that his doctors have assured him that his condition, which he learned of last Wednesday, is “not life-threatening or even debilitating in any meaningful way.”

The world’s third-richest person said the cancer, which is at an early stage, was discovered because his PSA levels jumped in a recent checkup, leading his doctors to conduct a biopsy. Buffett said he will begin a two-month radiation program in mid-July, and that though his travel schedule may be restricted his usual routine should be otherwise unaffected. There is plenty of reason to hope for the best, as the five-year survival rate for Buffett’s diagnosis is nearly 100% according to the American Cancer Society.