Benedikt Tissot enhanced the Symbolics.jl repository by updating the documentation for the substitute function, focusing on the fold parameter. He clarified how the fold option determines whether expressions are evaluated during substitution, and provided a concrete example demonstrating usage with fold set to false. This technical writing effort, implemented in Julia, improved API guidance for users working with symbolic expressions that should remain unevaluated. By leveraging documentation tooling and commit-based traceability, Benedikt’s work addressed a nuanced aspect of the library, reducing onboarding friction and support needs. The update reflected a precise, user-oriented approach to technical communication and documentation quality.