Alberto Herrera Vargas restored and documented the color property for the Seek API in the lichess-org/api repository, enabling clients to specify move colors as random, white, or black, with random as the default. He approached this by updating the API documentation using YAML, ensuring that the new property and its behavior were clearly described and aligned with the underlying codebase. This work focused on improving API semantics, reducing ambiguity for integrators, and supporting smoother client onboarding. Alberto demonstrated skills in API documentation and careful API design, contributing to stronger maintainability and minimizing documentation drift over the course of the month.