In documents filed with regulators on Thursday, Barnes & Noble (BKS) revealed that it has agreed to a co-branding partnership with technology giant Microsoft (MSFT).

In the Securities and Exchange Commission (SEC) filing, Barnes & Noble said that, under the agreement, reading material delivered by NOOK Media would be co-branded with the Microsoft Consumer Reader. The co-branding deal amends an existing agreement between Microsoft and the struggling book retailer.

According to the documents, some elements of the deal were redacted from the filing for confidentiality reasons.

Under the amendment to their existing agreement, Barnes & Noble is permitted to “discontinue distributing the NOOK Windows app” under certain conditions. Barnes & Noble may also drop development efforts to create a NOOK app for Windows smartphones.

Last month, Barnes & Noble denied rumors that it had eliminated the engineering team for its Nook tablet, which has failed to compete successfully with tablets from Apple (AAPL), Amazon (AMZN) and Samsung.

Microsoft made a $300 million investment in Barnes & Noble’s textbook and NOOK units in 2012.

Barnes & Noble stock rose more than 1% in Thursday morning trading, while Microsoft shares edged up slightly.