fixup! fixup! fixup! CMP: add documentation #1258

Job	Run time
compiler (gcc-7, ubuntu-20.04)	4m 18s
compiler (gcc-8, ubuntu-20.04)	4m 16s
compiler (gcc-9, ubuntu-20.04)	4m 25s
compiler (gcc-10, ubuntu-20.04)	4m 15s
compiler (gcc-11, ubuntu-22.04)	4m 19s
compiler (gcc-12, ubuntu-22.04)	4m 47s
compiler (gcc-13, ubuntu-22.04, ubuntu-toolchain-r/test)	5m 2s
compiler (clang-6.0, ubuntu-20.04)	4m 38s
compiler (clang-7, ubuntu-20.04)	4m 33s
compiler (clang-8, ubuntu-20.04)	4m 38s
compiler (clang-9, ubuntu-20.04)	4m 43s
compiler (clang-10, ubuntu-20.04)	4m 34s
compiler (clang-11, ubuntu-20.04)	4m 33s
compiler (clang-12, ubuntu-20.04)	4m 33s
compiler (clang-13, ubuntu-22.04)	4m 44s
compiler (clang-14, ubuntu-22.04)	4m 51s
compiler (clang-15, ubuntu-22.04, jammy)	4m 52s
compiler (clang-16, ubuntu-22.04, jammy)	4m 53s
compiler (clang-17, ubuntu-22.04, jammy)	4m 56s
	1h 27m 50s

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