2.5.4. Section 4: Final Recommendations. Same as the regular ICD with the addition of the “IT Box.” Discussion in this section should be tailored to the IS solution and focus on how the Sponsor intends to develop and deliver the required capabilities detailed above.

For reference or comparison, below is what the JCIDS Manual says for the ICD 2021 itself:

2.5.5.3.1. Evolution of a fielded capability solution(s) with significant capability improvement, including development and fielding of improved IS, improved components or subsystems to address high obsolescence rates, or other upgrades and product improvements.