Online retailer Amazon.com Inc. said Wednesday that it has expanded its licensing agreement with PBS to let members of its Amazon Prime premium shipping program watch current and older PBS programs.

Amazon said this will bring the total number of instant videos available to Prime members - who pay $79 a year for discounted shipping costs - to 12,000.

Financial terms of the deal were not disclosed.

Available PBS titles will include "Nova," "Antiques Roadshow," "The National Parks: America's Best Idea" and the new Ken Burns documentary series "Prohibition," which premiered earlier this month. The shows will roll out over the "next several months," Amazon said.

In addition, 200 episodes "The French Chef" with Julia Child will be available beginning in early November.

Amazon, Netflix Inc., Apple Inc. and other online video providers have been in a race to add content to their services.

Shares of Seattle-based Amazon fell $2.38 to $241.50 in morning trading Wednesday.