RBC Capital Markets has scored a role in the most highly anticipated IPO of the year, but the cast is becoming so big that the bragging rights are being diluted.

Facebook disclosed in documents with regulators Wednesday that it has added another slew of investment banks to its main underwriting roster: Citigroup, Credit Suisse, Deutsche Bank, Wells Fargo, and RBC.

Those banks and the original ones (Morgan Stanley, J.P. Morgan, Goldman, Merrill, Pierce, Fenner & Smith and Barclays) have collectively agreed to set up a five-year $5-billion (U.S.) credit facility for Facebook, and a bridge facility.

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In addition, another 10-plus banks, including BMO Capital Markets, will have bit parts.

The full documents are available here.