[NTG-context] macOS: Spotlight indexing of manuals?

Spotlight on macOS can help me to find the right documentation. When I copy the contents of the folder (the manuals for ConTeXt) from its original location /usr/local/context-osx-64/tex/texmf-context/doc/context/documents/general/manuals to ~/Downloads/TestFolder they are indexed and found by Spotlight. But not in their original location. Why? And how do I fix this, because I want the manuals and such in /usr/local to be found. Any Mac user who knows? G