From the press release:

Credit Suisse AG Announces Event Acceleration of its XIV ETNs

New York February 6, 2018 Credit Suisse AG ("Credit Suisse") today announced the event acceleration of its VelocityShares™ Daily Inverse VIX Short Term ETNs ("XIV") due to an acceleration event. The acceleration date is expected to be February 21, 2018.

Since the intraday indicative value of XIV on February 5, 2018 was equal to or less than 20% of the prior day's closing indicative value, an acceleration event has occurred. Credit Suisse expects to deliver an irrevocable call notice with respect to the event acceleration of XIV to The Depository Trust Company by no later than February 15, 2018. The date of the delivery of the irrevocable call notice, which is expected to be February 15, 2018, will constitute the accelerated valuation date, subject to postponement due to certain events.