Dear Craig:
THanks for your quick reaction. I was specifically confused about chapter 34.2 (13th edition), where the example includes the line:
list(APPEND CMAKE_MODULE_PATH ${CMAKE_CURRENT_LIST_DIR}/cmake)
and then loads a module with include(dependencies.cmake). Since that is the only module loaded in the example, I concluded that it would reside in the cmake subdirectory (since otherwise above line would be superfluous). Anyhow, your response clarifies- thanks!