We present the development of the adjoint of a comprehensive cloud droplet formation parameterization for use in aerosol-cloud-climate interaction studies. The adjoint efficiently and accurately calculates the sensitivity of cloud droplet number concentration (CDNC) to all parameterization inputs (e. g. https://safeersappliancers.shop/product-category/aeg-hc411521gb-36cm-domino-gas-wok-burner/